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 18.104.22.168 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
Should the S-ON be the flashing problem?
Thanks for helping me !!!