[Q] Reviving my SGS4 i9505 topic

I flashed the leaked 4.4.2 from samobile and all went well. I then tried to flash (with odin 3.09) the latest TWRP to afterwards flash the latest Echoe ROM and during that flashing I inadvertently disconnected my phone. It now comes up with the 'Firmware update failed, please restore with KIES' message and
'write protection enabled'. Trying to flash *any* other ROM fails with 'write failed'. Is there a way to get my phone working again, and if yes, how?

Thanks in advance
Philipp