Palma 2 Pro just does not accept those commands in fastboot mode.
Fastboot boot rec.img ends up with error. Something like "unrecognized command" I think. It just does not accept boot or flash commands

Also fastboot oem unlock and fastboot flashing unlock just fails.
Also disabling that verification from ADB does not work
Code:
adb disable-verity
/system/bin/sh: disable-verity: inaccessible or not found
I just do not know how to unlock bootloader on this device.
I've contacted Boox and their response was:
Quote:
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We are unable to provide information about unlocking the device's bootloader. In this case, you can submit feedback via "Settings" > "Feedback" > "+" on your device. Our tech team will get back to you on the feedback system as soon as possible.
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So I tried that feedback option. I think they will just say no or something

But no response so far.