HINO ECU TUNING
Hino ECU tuning · Denso SH7058 · SH72543

Hino tuning, flashed remotely.

2010–2026 Hino trucks are flashed remotely through the OBD port. Older pre-DEF Hino ECUs are flashed remotely on the bench. Already have Hino DX3? Send us the DX3 flash file (the .rpr, or the .sob extracted from it) and program the modified one back yourself — no bench read, no opening the ECU.

OBD remote flash 2010–2026 Any J2534 interface Bench remote flash, pre-DEF DX3 RPR / SOB flash files Hino DCU by DX3 File service all Hinos Denso SH7058 Denso SH72543 Remote reset service Bosch EDC17CV41 Cummins CM2350 / CM2450
1,500+Hino ECU files in our library
300+ECU software versions on file
2010–2026flashed through the OBD port
Any J2534interface works for remote jobs

Four ways to get your Hino done

Pick whichever fits the truck and the tools you already have. All four end the same way: a checksum-corrected file written to the ECU, and your original kept as the way back to stock.

Most trucks

Remote OBD flash

For 2010–2026 Hino with a Denso SH7058 or SH72543 engine ECU. The ECU stays in the truck. We connect to your laptop and, using your J2534 interface on the diagnostic port, read the ECU, modify the file and write it back in the same session.

  • Works with any J2534 interface
  • No ECU removal, no opening the case
  • Read, modify and write in one booking
  • Original read saved for you
Older trucks

Remote bench flash

For older pre-DEF Hino with a Denso SH7058 ECU that can’t be done through the port. The ECU comes out of the truck and is connected on your bench with a bench harness and a J2534 interface; we read and write it remotely from there.

  • Bench harness + any J2534 interface
  • ECU on the bench at your shop, case stays closed
  • We guide the hookup
  • Same remote read / write session
You have DX3

DX3 flash file (RPR / SOB)

Hino DX3 programs each module from a .rpr flash file; the .sob is that RPR extracted. Send us either one, we return it modified, and you program the truck with DX3 like a factory update.

  • No bench read, no boot pins
  • Package stays DX3-valid
  • Engine ECU and Hino DCU — .rpr or extracted .sob
  • We can rebuild from your own modified bin
How the DX3 route works →
You have a flash tool

File service — all Hinos

Read the ECU with your own tool and send us the file. We modify it, correct the checksums and send it back ready to write. Every Hino ECU is covered, including the Bosch EDC17CV41.

  • Denso SH7058, SH7055, SH72543
  • Bosch EDC17CV41
  • Any read: OBD, bench or boot
Send us your file →
Hino with a Cummins engine

Cummins-powered Hino — remote over Calterm, or file service

Newer Hino L Series and XL Series trucks run Cummins B6.7 and L9 engines. Those are covered too: we connect remotely and work on the Cummins CM2350 / CM2450 ECM over Calterm, or you send us the file and flash it with your own tool.

Book a Cummins Hino
Remote reset service

Dash lit up like a Christmas tree? We can fix it.

Warning lights everywhere, stuck in derate, codes that keep coming back? We connect remotely with any J2534 interface, read what the truck is complaining about, and reset it — no tow, no dealer visit.

Book a remote reset

What we do to the file

Tick what you need on the upload form. Every file is checksum-corrected before it goes back to you.

Stage 1 / ECO

More torque and power, or a fuel-economy calibration, within safe limits for the engine.

DPF

DPF system off, with regeneration and the related monitoring handled in the calibration.

EGR

EGR off, with the matching diagnostics dealt with so it doesn’t derate.

SCR / DEF

DEF (AdBlue) system off, including the inducement and derate logic.

DTC off

Selective fault-code removal — only the codes you list, nothing else touched.

Coverage

Not sure which ECU you have? Send the ECU part number (89663-xxxxx on the label) or just upload the read — we check it and tell you before anything is charged. The switch from SH7058 to SH72543 came with the 2016 model year.

TrucksECURemote OBDRemote benchDX3 RPR / SOBFile service
Hino 2010–2015
J05E / J08E engines
Denso SH7058 (1 MB)YesYesYesYes
Hino 2016–2026
J05E / J08E engines
Denso SH72543 (2 MB)YesAskYesYes
Hino DCU
DEF dosing control unit
Hino DCU——YesYes
Older pre-DEF HinoDenso SH7058 (1 MB)—YesYesYes
Hino L / XL Series
Cummins B6.7 / L9
Cummins CM2350 / CM2450Yes — Calterm——Yes
Hino with Bosch ECUBosch EDC17CV41 (4 MB)AskAsk—Yes

Is my Hino ECU supported?

Type the ECU part number from the label (89663-xxxxx) or the software ID inside the file (for example BG60YK71B380). These are the Hino ECU numbers already in our library. Not listed? Send it anyway — we check it before anything is charged.

  • 89663-37572 · BSA0YL86B430SH7058
  • 89663-37572A · BSA0YL86B430SH7058
  • 89663-37572B · BSA0YL86B430SH7058
  • 89663-37N21 · DQ00YP38J030SH7058
  • 89663-E0051 · BN30YL37B610SH7058
  • 89663-E0060A · BN30YL37L110SH7058
  • 89663-E0411 · BG60YK71B380SH7058
  • 89663-E0D13 · BN30YL37B610SH7058
  • 89663-E0D80SH7058
  • 89663-E0J50 · BE60YK83E000SH7055
  • 89663-E0J70 · BD20YK82B000SH7055
  • 89663-E0J80 · BD40YK82B100SH7055
  • 89663-E0J90 · BY30YK83A050SH7055
  • 89663-E0K00 · BY30YK83C050SH7058
  • 89663-E0K00A · BY70YK83C060SH7058
  • 89663-E0K51SH7058
  • 89663-E0K72B · BRE0YL88B150SH7058
  • 89663-E0K83 · BSA0YL86B430SH7058
  • 89663-E0K83C · BSA0YL86B430SH7058
  • 89663-E0P20 · BW40YK70F100SH7058
  • 89663-E1180A · R360YM12B710SH7058
  • 89663-E1240 · BR70YL88B100SH7058
  • 89663-E1241A · BRA0YL88B130SH7058
  • 89663-E1241B · BRA0YL88B130SH7058
  • 89663-E1241D · BRC0YL88B140SH7058
  • 89663-E1242C · BRE0YL88B150SH7058
  • 89663-E1251A · BRA0YL88C130SH7058
  • 89663-E1251B · BRA0YL88C130SH7058
  • 89663-E1251D · BRC0YL88C140SH7058
  • 89663-E1252 · BRE0YL88B150SH7058
  • 89663-E1252B · BRE0YL88B150SH7058
  • 89663-E1260 · BS70YL86B100SH7058
  • 89663-E1270 · BR70YL88D100SH7058
  • 89663-E1270A · BR70YL88D110SH7058
  • 89663-E1280A · BS70YL86B210SH7058
  • 89663-E1853 · BN50YL37B830SH7058
  • 89663-E1A50 · BQ50YL35BC00SH7058
  • 89663-E1A95 · BP80YL36G150SH7058
  • 89663-E1B15 · BP80YL36G150SH7058
  • 89663-E1E73 · BQ60YL35BC30SH7058
  • 89663-E1F50 · BRA0YL88B200SH7058
  • 89663-E1F51C · BRC0YL88B140SH7058
  • 89663-E1F52B · BRE0YL88B150SH7058
  • 89663-E1F60 · BRA0YL88C200SH7058
  • 89663-E1F61 · BRA0YL88B210SH7058
  • 89663-E1F61C · BRC0YL88C140SH7058
  • 89663-E1F62 · BRE0YL88B150SH7058
  • 89663-E1F62A · BRE0YL88B150SH7058
  • 89663-E1F62B · BRE0YL88B150SH7058
  • 89663-E1J20 · BS80YL86B400SH7058
  • 89663-E1J20A · BS80YL86B410SH7058
  • 89663-E1J21A · BS80YL86B420SH7058
  • 89663-E1J22 · BSA0YL86B430SH7058
  • 89663-E1J22B · BSA0YL86B430SH7058
  • 89663-E1L40 · BT60YK71B900SH7058
  • 89663-E1T60 · R370YM12V200SH7058
  • 89663-E1V13B · R6F0YM52C060SH7058
  • 89663-E1V13C · R6F0YM52C060SH7058
  • 89663-E1V14 · R6F0YM52C060SH7058
  • 89663-E1V16 · R6H0YM52C070SH7058
  • 89663-E1V17 · R6H0YM52C070SH7058
  • 89663-E1V18 · R6K0YM52C080SH7058
  • 89663-E1V20D · R6B0YM52D030SH7058
  • 89663-E1V23A · R6F0YM52D050SH7058
  • 89663-E1V23C · R6F0YM52D060SH7058
  • 89663-E1V24 · R6F0YM52D060SH7058
  • 89663-E1V27 · R6H0YM52D070SH7058
  • 89663-E1V28SH7059
  • 89663-E1V28 · R6K0YM52D080SH7058
  • 89663-E2011C · RAC0YM88C040SH7058
  • 89663-E2283 · RAC0YM88G030SH7058
  • 89663-E2311 · R9D0YM99G020SH7058
  • 89663-E2331 · R9D0YM99F020SH7058
  • 89663-E2333 · R9D0YM99F020SH7058
  • 89663-E2390B · R970YM99H110SH7058
  • 89663-E2573 · R5H0YM434100SH7058
  • 89663-E2650C · RD80YN10C020SH7058
  • 89663-E2652A · RDA0YN10C050SH7058
  • 89663-E2654 · RDC0YN10C060SH7058
  • 89663-E2674 · RDC0YN10C140SH7058
  • 89663-E2773B · REB0YN39C030SH7058
  • 89663-E2774 · REB0YN39C030SH7058
  • 89663-E2776 · REL0YN39C040SH7058
  • 89663-E2777 · REP0YN39C050SH7058
  • 89663-E2783A · REB0YN39D020SH7058
  • 89663-E2783B · REB0YN39D030SH7058
  • 89663-E2784 · REB0YN39D030SH7058
  • 89663-E2786 · REL0YN39D040SH7058
  • 89663-E2787 · REP0YN39D050SH7058
  • 89663-E2B40A · RE50YN39C010SH7058
  • 89663-E2B42 · REF0YN39C220SH7058
  • 89663-E2B43 · REF0YN39C220SH7058
  • 89663-E2B44 · REF0YN39C220SH7058
  • 89663-E2B46 · REK0YN39C230SH7058
  • 89663-E2B47 · REN0YN39C240SH7058
  • 89663-E2B53 · REF0YN39D220SH7058
  • 89663-E2B56 · REK0YN39D230SH7058
  • 89663-E2B57 · REN0YN39D240SH7058
  • 89663-E2C01 · RC30YM77B200SH7058
  • 89663-E2K51 · R5M0YM430100SH7058
  • 89663-E2M21 · RTB0YM66Y200SH7058
  • 89663-E2P12 · REF0YN39C050SH7058
  • 89663-E2P12A · REF0YN39C050SH7058
  • 89663-E2P13 · R6F0YM52C060SH7058
  • 89663-E2P13 · REF0YN39C050SH7058
  • 89663-E2P14SH7058
  • 89663-E2P15 · REK0YN39C060SH7058
  • 89663-E2P16 · REK0YN39C060SH7058
  • 89663-E2P17 · REN0YN39C070SH7058
  • 89663-E2P23 · REF0YN39D020SH7058
  • 89663-E2P23 · REF0YN39D050SH7058
  • 89663-E2P24 · REF0YN39D050SH7058
  • 89663-E2P26 · REK0YN39D060SH7058
  • 89663-E2P27 · REN0YN39D070SH7058
  • 89663-E2U40B · R9T0YM99P010SH7058
  • 89663-E2U41 · R9T0YM99P010SH7058
  • 89663-E2U80C · R9T0YM99P210SH7058
  • 89663-E2X40B · R5B0YM439210SH7058
  • 89663-E2Y61 · RB90YM66M010SH7058
  • 89663-E2Y73 · RT00YM66E030SH7058
  • 89663-E3010C · RED0YN39C120SH7058
  • 89663-E3013 · RED0YN39C120SH7058
  • 89663-E3015 · REJ0YN39C130SH7058
  • 89663-E3016 · REJ0YN39C130SH7058
  • 89663-E3017 · REM0YN39C140SH7058
  • 89663-E3023 · RED0YN39D120SH7058
  • 89663-E3026 · REJ0YN39D130SH7058
  • 89663-E3027 · REM0YN39D140SH7058
  • 89663-E3031A · RG80YN41C030SH7058
  • 89663-E3033 · RGD0YN41C040SH7058
  • 89663-E3034 · RGD0YN41C040SH7058
  • 89663-E3044 · RGD0YN41C140SH7058
  • 89663-E3301 · R5H0YM434100SH7058
  • 89663-E3563 · R9D0YM99F500SH7058
  • 89663-E3582 · RBE0YM66S000SH7058
  • 89663-E3650D · RH00YN39C140SH7058
  • 89663-E3650F · RH00YN39C140SH7058
  • 89663-E3651 · RH00YN39C140SH7058
  • 89663-E3653 · REH0YN39C350SH7058
  • 89663-E3654 · REH0YN39C350SH7058
  • 89663-E3660D · RH00YN39D140SH7058
  • 89663-E3661 · RH00YN39D140SH7058
  • 89663-E3663 · REH0YN39D350SH7058
  • 89663-E3664 · REH0YN39D350SH7058
  • 89663-E3670A · RG90YN41C200SH7058
  • 89663-E3671 · RG90YN41C200SH7058
  • 89663-E3674 · RGC0YN41C210SH7058
  • 89663-E3684 · RGC0YN41C310SH7058
  • 89663-E3791 · RX60YP59C200SH7058
  • 89663-E3891A · RW60YP61D110SH72543
  • 89663-E3E12 · R8Z0YM58J500SH7058
  • 89663-E3G52 · R8Z0YM58X110SH7058
  • 89663-E3L22 · RN80YP21C020SH72543
  • 89663-E3L25 · RNJ0YP21C030SH72543
  • 89663-E3L26B · DB70YP21C050SH72543
  • 89663-E3L28 · DBG0YP21C060SH72534
  • 89663-E3L32 · RN80YP21D020SH72543
  • 89663-E3L36B · 041701EDC17C01
  • 89663-E3L36B · DB70YP21D050SH72543
  • 89663-E3L38 · DBG0YP21D060SH72534
  • 89663-E3L40 · RQ50YP22C000SH7058
  • 89663-E3L41 · RQ50YP22C000SH72543
  • 89663-E3L47B · DC70YP22C040SH72543
  • 89663-E3L49A · DCL0YP22C060SH72543
  • 89663-E3L50 · RQ50YP22D000SH72543
  • 89663-E3M00 · RL90YN68C200SH7058
  • 89663-E3P32 · R8Z0YM58S500SH7058
  • 89663-E3R20B · RNB0YP21E010SH72543
  • 89663-E3R22A · RNG0YP21E030SH72543
  • 89663-E3R24 · RNG0YP21E030SH72543
  • 89663-E3R25B · DB80YP21E050SH72543
  • 89663-E3R27 · DBH0YP21E060SH72543
  • 89663-E3R30B · RNB0YP21D110SH72534
  • 89663-E3R32A · RNG0YP21D130SH72543
  • 89663-E3R34 · RNG0YP21D130SH72543
  • 89663-E3R35B · DB80YP21D150SH72543
  • 89663-E3R37 · DBH0YP21D160SH72543
  • 89663-E3R42A · RQG0YP22C120SH72543
  • 89663-E3R45B · DC80YP22C140SH72543
  • 89663-E3R47A · DCK0YP22C160SH72543
  • 89663-E3R57A · DCK0YP22D160SH72543
  • 89663-E3V80SH7058
  • 89663-E3W50 · R9T0YM99Q100SH7058
  • 89663-E3W51 · R9T0YM99Q100SH7058
  • 89663-E3X04 · RVD0YP26C040SH72543
  • 89663-E4020B · RNL0YP21E100SH72543
  • 89663-E4021A · RNR0YP21E110SH72543
  • 89663-E4023A · RNX0YP21E120SH72543
  • 89663-E4025C · DB50YP21E140SH72543
  • 89663-E4027A · DBF0YP21E150SH72543
  • 89663-E4028 · DBF0YP21E150SH72543
  • 89663-E4030B · RNL0YP21D100SH72543
  • 89663-E4031A · RNR0YP21D110SH72543
  • 89663-E4033A · RNX0YP21D120SH72543
  • 89663-E4035C · DB50YP21D140SH72543
  • 89663-E4036A · DBF0YP21D150SH72543
  • 89663-E4037 · DBF0YP21D150SH72543
  • 89663-E4041A · RQR0YP22C210SH72543
  • 89663-E4043A · RQX0YP22C220SH72543
  • 89663-E4044A · RQX0YP22C220SH72543
  • 89663-E4046A · DCF0YP22C250SH72543
  • 89663-E4048 · DCF0YP22C250SH72534
  • 89663-E4622A · RNY0YP21E220SH72543
  • 89663-E4623C · DB40YP21E240SH72543
  • 89663-E4626 · DBD0YP21E260SH72543
  • 89663-E4633C · DB40YP21D240SH72543
  • 89663-E4635 · DBD0YP21D260SH72543
  • 89663-E4642A · RQY0YP22C310SH72543
  • 89663-E4643C · DC40YP22C330SH72543
  • 89663-E4644C · DCD0YP22C350SH72543
  • 89663-E4645 · DCD0YP22C350SH72543
  • 89663-E4B90A · RVB0YP26G300SH72543
  • 89663-E4B91 · RVB0YP26G300SH72543
  • 89663-E4D21 · DBC0YP21E320SH72543
  • 89663-E4D31 · DBC0YP21D320SH72543
  • 89663-E4D41 · DCC0YP22C410SH72543
  • 89663-E4G14 · RPS0YM91R010SH72543
  • 89663-E5G83 · DTE0YP22C800SH72543
  • 89663-E5G84 · DTG0YP22C810SH72543
  • 89663-E5K62 · DSE0YP21D600SH72543
  • 89663-E5K63 · DSE0YP21D600SH72543
  • 89663-E5K64 · DSE0YP21D600SH72543
  • 89663-E5K65 · DSG0YP21D610SH72543
  • 89663-E5K66 · DSG0YP21D610SH72543
  • 015541EDC17CV41
  • 015888EDC17C01
  • 021029EDC17CV41
  • 021212EDC17C01
  • 021213EDC17C01
  • 024538EDC17C01
  • 031831EDC17C01
  • 035324EDC17C01
  • 035331EDC17C01
  • 040265EDC17C01
  • 040266EDC17C01
  • 041701EDC17C01
  • 043143EDC17C01
  • 044247EDC17C01
  • 044248EDC17C01
  • 048640EDC17C01
  • 048641EDC17C01
  • 048642EDC17C01
  • 048643EDC17C01
  • 051395EDC17C01
  • 051403EDC17C01
  • 067905EDC17C01
  • 069000EDC17C01
  • 128215EDC17C01
  • 128216EDC17C01
  • 507426EDC17CV41
  • 513508EDC17CV41
  • 513561EDC17C01
  • 517619EDC17CV41
  • 518878EDC17CV41
  • 521700EDC17C01
  • 521724EDC17C01
  • 521746EDC17C01
  • 521747EDC17C01
  • 531402EDC17CV41
  • 531442EDC17CV41
  • 531599EDC17CV41
  • 531721EDC17CV41
  • 539618EDC17C01
  • 539619EDC17C01
  • 539635EDC17C01
  • 539636EDC17C01
  • 539639EDC17C01
  • 539654EDC17C01
  • 539660EDC17C09
  • 556255EDC17C01
  • 556260EDC17C01
  • 556306EDC17C01
  • 557901EDC17C01
  • 557929EDC17C01
  • 558944EDC17C01
  • 558945EDC17C01
  • 559277EDC17C01
  • 560000EDC17C01
  • 560025EDC17C01
  • 560110EDC17C01
  • 560192EDC17C01
  • 562301EDC17C01
  • BB50YK14B040SH7055
  • BD20YK82A010SH7055
  • BD20YK82A030SH7055
  • BD40YK82A130SH7055
  • BE30YK83A030SH7055
  • BE30YK83C010SH7055
  • BE30YK83C020SH7055
  • BE30YK83C030SH7055
  • BE60YK83B040SH7055
  • BQ30YL35B010SH7058
  • BQ40YL35B400SH7058
  • BRA0YL88C130SH7058
  • CA186M07A131SH7058
  • DB70YP21D050SH72543
  • DBF0YP21D150SH72543
  • DSE0YP21D600SH72543
  • J50HF4HDE075SH7058
  • REB0YN39D030SH7058
  • REF0YN39C050SH7058
  • REJ0YN39C130SH7058
  • REM0YN39C140SH7058
  • REN0YN39C070SH7058
  • REP0YN39C050SH7058
  • XE024H22T202DC1U
  • XE034H22T203DC1U

Hino models we tune

North American conventionals and cab-overs, plus export models and machines running Hino engines.

Conventional

Hino 238 · 258 · 268 · 338 · 358

J08E 7.7 L six-cylinder (J08E-VB, J08E-VC, J08E-WU). Denso SH7058 through 2015, Denso SH72543 from 2016.

Cab-over

Hino 155 · 195

J05E 5.1 L four-cylinder. Older Hino 145 / 165 / 185 with the J05D are done on the bench.

Export & machines

Hino 300 · 500 · 700 · Ranger

Export trucks and buses on Denso ECUs, plus Kobelco excavators and other machines fitted with Hino engines.

Cummins power

Hino L Series · XL Series

L6 / L7 with the Cummins B6.7 and XL7 / XL8 with the Cummins L9, on the Cummins CM2350 / CM2450 ECM. Done remotely over Calterm, or by file service.

How it works

The same four steps whichever route you use.

Tell us the truck

Model, year, engine and the ECU part number. Upload a read or a DX3 flash file if you already have one.

We confirm the route

OBD, bench, DX3 or file service — and the price. For a remote flash you need a laptop, internet and any J2534 interface (plus a bench harness for bench jobs).

Read and modify

We read the ECU remotely (or take your file), apply the options you chose and correct the checksums.

Write and verify

The file is written back, codes are cleared and the truck is checked. Your original stays on file.

Upload a file or book a remote flash

Drop a full read, an EEPROM read or a DX3 RPR / SOB flash file. No file yet? Fill in the truck details and send — we’ll set up the remote session.

Your file

The file is identified in your browser first. It is uploaded to our server when you press Send, so it reaches us together with your request.

Drop your read or DX3 flash file here or click to choose — .bin .ori .mpc .zip .sob .rpr .mot .hex

The file is uploaded when you press Send.

  • OBD / benchNo file needed — just fill in the truck details.
  • DX3 RPR / SOBSend the .rpr, or zip the extracted folder exactly as it is. Don’t rename, open or edit anything inside.
  • File serviceAny Hino, any tool — send the full read, unmodified. Denso or Bosch EDC17CV41.

Truck and options

Options

Prefer to just talk? WhatsApp +66 98 861 6568  ·  admin@ecudevelopers.com

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Scan to chat on WhatsApp

Point your phone camera at the code to open a chat with us at +66 98 861 6568. On a phone already? Tap here.

FAQ

Which Hino trucks can you flash through the OBD port?

2010–2026 Hino trucks with a Denso SH7058 or Denso SH72543 engine ECU. Send the ECU part number or a photo of the label and we confirm it before booking.

My Hino is older, before DEF. Can you still do it remotely?

Yes. Older pre-DEF Hino trucks with the Denso SH7058 ECU are done remotely on the bench: the ECU comes out and is connected on your bench with a bench harness and any J2534 interface, and we read and write it from there.

What do I need for a remote flash?

A Windows laptop with internet and any J2534 interface. For OBD jobs that plugs into the truck’s diagnostic port. For bench jobs you also need a bench harness to power and connect the ECU. We do the rest over a remote session.

My dash is lit up like a Christmas tree. Can you help remotely?

Yes. That is our remote reset service. With a laptop, internet and any J2534 interface on the diagnostic port, we connect remotely, read the fault codes and reset the truck so the lights go out and it comes out of derate. Tell us which lights and codes you have when you book.

I only have Hino DX3. Is that enough?

For the DX3 route, yes. Send us the DX3 .rpr flash file (or the .sob extracted from it) and program the returned file with DX3. See the DX3 RPR / SOB page for the details.

I have my own flash tool. Can I just send you the file?

Yes. The file service covers all Hinos: read the ECU with whatever tool you use, upload the file, and we send it back modified and checksum-corrected. That includes the Bosch EDC17CV41 as well as the Denso SH7058, SH7055 and SH72543.

My Hino has a Cummins engine. Can you do it?

Yes. Cummins-powered Hino trucks (L Series with the B6.7, XL Series with the L9) are done remotely over Calterm, or through the file service if you read and write the ECM with your own tool.

Do you do the Hino DCU as well?

Yes. The Hino DCU (the DEF dosing control unit) is flashed with Hino DX3 from a .rpr file; the .sob firmware is what you get when the .rpr is extracted. Send us the DCU .rpr (or the extracted .sob files) and write the returned one back with DX3, the same way as the engine ECU.

Can I go back to stock?

Yes. Your original read or DX3 flash file is kept on file, and you should keep your own copy too. Writing it back returns the ECU to stock.

I tune my own files. Can you just do the conversion?

Yes. If you modify the binary yourself, we can rebuild a DX3-valid flash file from it, as long as it comes from the same original RPR.