Trapped in fastboot mode with locked bootloader and corrupted custom ROM

[FPbonn]

@Yanngui

On top of that, Fairphone support won’t send my secondhand Fairphone 4 to the repair center—even if I pay for it myself—because I don’t have the original invoice.

Not having an invoice is unfortunately very common, if purchase a phone 2nd or 3rd hand.

For legal reasons it’s not possible to get a signed edl loader from Fairphone, Cordon or Qualcomm - see discussion.