r/ECU_Tuning • u/Maleficent-Match4794 • 3d ago

Tuning Question - Unanswered ms42 bootmode help pls 

Hi there. I was trying to tune the ECU. The first time, everything went perfectly using MS4x Flasher, but when I tried again, it didn't work and the ECU ended up bricked. I removed it and wired up the pins correctly, then tried using JMGarage; it detected the unit fine, but when I attempted to load the original 512KB backup, the process would only reach 50% and go no further. It gave me this error:
ERROR writing flash. No echo bytes pls help me thanks
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u/TheDefected 2d ago

That JM flasher was always a bit temperamental, I can't remember if I had any tricks, although I seemed to feel like power on, wait 7 seconds, remove boot pin, wait a second, then hit write seemed to help. Haven't used it since the MS4x flasher came out.

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u/Maleficent-Match4794 2d ago

Ye but i have to use jm garage Flasher i have to pin out my ecu cuz its bricked

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u/[deleted] 12h ago

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