So I installed and tested UT on my FP4, and it just isn't quite for me yet. I was going to re-install the FP4 ROM as per Fairphone's instructions, however I can't get into fastboot mode from the bootloader.

I use "volume up + power" key to get into UBports Recovery menu, then select Advanced > 'Enter fastboot'. But from there, the device just becomes unresponsive, and it isn't recognized by the Fairfphone flashing utility (using Windows). If I hold power button I get an active black screen, and device remains unrecognized by flashing utility.

(Selecting "enable ADB" from the same menu gets me to a black screen with "ADB enabled", but again the flashing utility doesn't recognize the device.)

Using the SDK Platform Tools in Windows, the device is recognized when UT is booted up but when I attempt to run "adb reboot bootloader" I get the error "Failed to write reboot parameter file" Permission denied". Developer Mode is enabled in UT.

I'm at a loss here...any ideas on why I'm failing to get into fastboot?