Possible reasons for hard-brick? ('fastboot flash' vs. 'fastboot flash boot' ?)

[yvmuell]

Else maybe this can help, although I didnt read in detail,

Fairphone 3 unbricking

If you end up in a situation, where your FP3 cannot get into fastboot on either slot, there is now an unbricking solution available using EDL/QDL mode. In this situation the phone will usually already be in EDL mode (lsusb output): Bus 001 Device 009: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode) You can however force EDL mode by holding both volume-buttons during power on. If your device comes up as: Bus 001 Device 009: ID 05c6:900e Qualcomm, Inc. Make sure you cannot enter F…