Input Keyevent in fastboot mode? I'm trying to unlock the bootloader of my old Alcatel OneTouch Idol X+. I got to the point where my phone would ask me to press volume-up to confirm that. Due to a bug of which i read several times now, the volume-up key won't work now.

I tried using that adb input keyevent command, which wouldn't work in fastboot mode. Are there other options, or some way to use adb commands in fastboot mode?
Unfortunately, no adb command works in Fastboot mode (or bootloader). The only way to communicate with a device in Fastboot mode is fastboot.

In your case, you should try finding a replacement key for the non-working one, or you're out of luck.