Thanks for your comments! The problem is that I cannot get adb to work at all. Nothing comes up when I try "adb devices". The display has remained frozen and does not change when I try to turn the device on or off.
This is very odd. Once, I messed up on my GL 4 by flashing the boot.img from the wrong update. The display went completely blank after that, but I could still access adb. With the GL4+ now, I can't. It's like everything is frozen. Only the light near the USB-C port responds when I connect it to a power source.
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