TG_Wired Posted April 16, 2023 Report Share Posted April 16, 2023 I have recently gotten a new in box G4 Xtreme for my project that was running and tuned before I attempted to update the firmware. The error is saying the ECU is in boot mode and that there was an error in updating and does not have permission. Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 16, 2023 Report Share Posted April 16, 2023 If you just power down the ecu and run the firmware update again it would usually recover from that. And when you get to the step where it tells you to power cycle the ignition, this time completely unplug the ecu to make sure it is fully powered down before reconnecting and clicking ok to continue. Quote Link to comment Share on other sites More sharing options...
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