FastECU

Hi Everyone,

I badly need help recovering this ECU.
Hitachi SH72543

Vehicle: Subaru Levorg 2016
Calibration: LF76400Q
Software: A660A17207

So this is what happened:
I was using pcmflash via obd to read/write this vehicle. It was working great, till I flashed a file and then the relays under the dash are flickering on / off.
So I did not try to start the engine.

WHAT I DID:
1. What I did was to try to put it back to stock, but it won't write using genuine pcmflash module 16.
2. I can ID it via obd or bench sometimes, I can read and clear DTC using pcmflash, but it won't let me read/write.
3. I've tried recovery mode of PCMflash but it's also unsuccessful.
4. I've also tried ECUFlash but when writing, it's saying it can't enter bootloader mode.

Need help, I can pay for help to recover this. Thank you so much

Here are the logs when flashing using FastECU.


[2025-10-18 19:26:36.708] Write memory with flashmethod 'sub_ecu_hitachi_sh72543r_can' and kernel 'C:/Users/troni/AppData/Local/FastECU/0.1.0-beta.4/kernels/ '
[2025-10-18 19:26:37.611] Connecting to Subaru ECU Hitachi CAN bootloader, please wait...
[2025-10-18 19:26:37.614] Trying ECU Init...
[2025-10-18 19:26:37.617] Sent: 00 00 07 e0 aa
\[2025-10-18 19:26:37.719] 0: 0xAA response: 00 00 07 e8 ea a3 10 0f a6 60 a1 72 07 41 80 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 04 00 00 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[2025-10-18 19:26:37.719] Init Success: CAL ID = A660A17207
[2025-10-18 19:26:37.721] Trying 0x09 0x04...
[2025-10-18 19:26:37.721] Sent: 00 00 07 e0 09 04
[2025-10-18 19:26:37.725] 0: 0x09 0x04 response: 00 00 07 e8 49 04 01 4c 46 37 36 34 30 30 51 00 00 00 00 00 00 00 00
[2025-10-18 19:26:37.725] Init Success: ECU ID = LF76400Q
[2025-10-18 19:26:38.453] Initializing bootloader...
[2025-10-18 19:26:38.457] Send msg: 00 00 07 e0 a8 00 00 00 d7
[2025-10-18 19:26:38.658] Received msg: 00 00 07 e8 e8 00
[2025-10-18 19:26:38.658] Send msg: 00 00 07 e0 a8 00 00 01 3b
[2025-10-18 19:26:38.871] Received msg: 00 00 07 e8 e8 01
[2025-10-18 19:26:38.871] Test script complete
[2025-10-18 19:26:38.871] Writing ROM to ECU Subaru using CAN
[2025-10-18 19:26:38.887] Blocks to flash : 1, (total: 1)
[2025-10-18 19:26:38.887] --- erasing ECU flash memory ---
[2025-10-18 19:26:38.887] Send msg: 00 00 07 e0 10 43
[2025-10-18 19:26:39.092] Received msg: 00 00 07 e8 7f 10 22
[2025-10-18 19:26:39.092] Failed to initialise bootloader
[2025-10-18 19:26:39.092] Starting seed request...
[2025-10-18 19:26:39.092] Send msg: 00 00 07 e0 27 01
[2025-10-18 19:26:39.522] Received msg:
[2025-10-18 19:26:39.524] No or bad response received
[2025-10-18 19:26:39.524] Seed request ok
[2025-10-18 19:26:39.531] Sending seed key...
[2025-10-18 19:26:39.531] Send msg: 00 00 07 e0 27 02 de 8c 07 a3
[2025-10-18 19:26:39.948] Received msg:
[2025-10-18 19:26:39.950] No or bad response received
[2025-10-18 19:26:39.952] Seed key ok
[2025-10-18 19:26:39.956] Jumping to onboad kernel...
[2025-10-18 19:26:39.957] Send msg: 00 00 07 e0 10 42
[2025-10-18 19:26:40.369] Received msg:
[2025-10-18 19:26:40.371] No or bad response received
[2025-10-18 19:26:40.373] Settting flash start & length...
[2025-10-18 19:26:40.375] Send msg: 00 00 07 e0 34 04 33 00 60 00 1f a0 00
[2025-10-18 19:26:40.883] Received msg:
[2025-10-18 19:26:40.886] No or bad response received
[2025-10-18 19:26:40.889] Erasing ECU ROM...
[2025-10-18 19:26:40.891] Send msg: 00 00 07 e0 31 01 02 01 0f ff ff ff
[2025-10-18 19:26:40.996] Received msg: 00 00 07 e8 7f 31 33
[2025-10-18 19:26:41.211] Received msg:
[2025-10-18 19:26:41.524] Received msg:
[2025-10-18 19:26:41.835] Received msg:
[2025-10-18 19:26:42.147] Received msg:

The Blank "Received msg:" will go on and on.

@SergArb can you look at this?

This ECU can't be recovered with FastECU.

ROM is corrupted.
[2025-10-18 19:26:38.887] Send msg: 00 00 07 e0 10 43
[2025-10-18 19:26:39.092] Received msg: 00 00 07 e8 7f 10 22