I misremembered. The .sh bootloader script was something else, but related to the Civic (but I can't seem to remember where I saw it).
This was the Chinese method to get a browser installed on the Civic. I highly suggest you do not do this as the Android versions are not similar and you could...
There is an option to enable rebooting into bootloader inside the dev options as I recall. From there it’s a matter of making a compatible USB stick and having the right startup.sh to accomplish the tasks you want.
I believe the 10th gen civic thread for Honda hack has some info about this...
this is essentially where things were left on page 2. No progress has been made since, as we are unable to authorize the device on the HU itself like android typically lets you do.
https://www.civicxi.com/forum/threads/honda-hack-root-11th-gen-work-in-progress-discoveries.49933/post-823444
To...
I think there might be something with hidden buttons on screen as well.
It’s also very possible that the adb functions are locked down by a USB key of some sort.
I’ve tried this but the drive just corrupted. I suppose it’s possible because it was fat32 formatted and the backup file it was trying to write was larger than 4GB.
I’ll get around to trying again another day but for those interested in checking it out don’t use fat32.
EDIT: exFAT doesn’t even...
My experience has been essentially the same as yours.
I tried messing around with revoking access/timing debugging on off/rebooting during plugin/etc... no matter what I remain sitting at unauthorized for the adb connection.
There has to be some new button combination to allow...