Unhappy [Q] Help with a bricked x920d

Hello members of xda. I think I messed up my phone.. again. But now I'm asking if someone could help me guide into a repair.
I have a HTC Butterfly x920d (Europe, Belgium) and I can't flash any rom. I tried like almost every available rom for my htc model and nothing is working. I can still reach the bootloader and recovery (TWRP 2.7.0.1 and already tried other versions). When I'm flashing a rom I'm always getting the 'failed' status immediatly Error flashing zip '/sdcard/NAMEOFROM.zip, updating partition details..., E: unable to mount cache. And then we get a fail. On every single zip/rom file... The only rom that was working was this one NOS_m7_v3.0.0_dlxbu1, but when I boot I get a black screen with the status bar on top and a flashing NFC logo. After a time he reboots and does the same. I don't get why there are no stock htc roms? So last time I did it on the warranty they asked me 450$ to repair it (it was a Sony then).

anyway here my bootloader stats:
*** Tampered ***
*** Unlocked ***
DELUXE_U PCT SHIP S-ON RH
HBOOT-1.55.0000
RADIO-3A.32.306.04
OPENDSP-V12.120.274.0909
OS-3.13.401.4
EMMC-BOOT 2048MB
HBOOT

Should the S-ON be the flashing problem?
Thanks for helping me !!!