Cannot flash / boot recovery

Hello,

i have huge problems booting into my recovery. The last time i remember it worked was before some FOTA update.

The phone is still rooted and the bootloader should be unlocked.

What i tried so far:

1. adb reboot recovery


2. fastboot reboot-recovery


3. Volume key combinations


4. several "reboot" appa

And to reflash the recovery:

1. several flashing apps


2. fastboot flash recovery

Any idea what could be the problem? If you need more informations, please tell me which you need!



//Edit: Found a solution: The installer on XZDual worked!