HELP PLEASE!! I cannot install LineageOS into my device (Fastboot Error)!!!
I've tried everything that I can think of and done the research, to no avail. The problem: I CANNOT work with Fastboot on my device. I can boot into it both manually (key combo) and through ADB (which DOES detect the device when it's turned on normally), yet upon entering Fastboot, it shows the following error when I input "fastboot devices":
C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot devices
???????????? fastboot
And immediately after, the phone exits Fastboot (rather, gives out a prompt that says "press any keys to shutdown"), and well, shuts down. So I cannot flash a recovery, nor OS, no nothing.
I've tried.... About a thousand online XDA/forum threads on the topic. Downloaded USB ADB Driver (android_winusb.inf file to be specific) and "updated driver" multiple times, to no avail. I've ALSO switched cables and USB ports!! Two different, working, USB-C cables, three different computer ports. No luck. ADB/Fastboot software is up to date on my PC and works fine for other commands; it's just Fastboot itself that isn't working.
Ok, that's all the info I've gathered thus far. Might I add, I've already flashed a custom ROM on my phone, so I know for a fact that Fastboot used to work just fine..... Used to being the keyword. Sad.
Any help is appreciated!