Previous post disappeared for some reason.
Yeah, this is always right after adb reboot edl.
Is checking the output of /u /g (and whatever overflows) enough to tell if the loader is working correctly or not? As in, I run /u /g, then /z. The output of /z carries some information from /u /g that I could just parse.
If I need to run anything else that's not /z after /u /g, it will return either "no response" or "cannot write", and I have to then hard reset by holding down power button.
By the way, I looked through the Boox devices I know of, only Max Lumi is the other one with 636 and UFS. I couldn't find anyone with working EDL there.
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