Save a bricked CX65

[gio91ber]

Hello.

I obtained a few months ago an half broken CX65 mobile, it was missing all T9 dictionaries and had a few other problems.

I looked around for firmwares to reflash but ended up only finding CX6V firmware. Don't know how or why but I managed to flash through a WinSwUpd program version 50 for CX6V but the phone was still missing T9 dictionary and in generaly its whole FFS.

Yesterday I came across a complete archive of firmwares from siemens for every phone and every language (global-repair-management[dot]com/dQw4w9WgXcQ/, if anyone is able to do so please post it front page on siemens forum) so I downloaded both an FFS and a CX65 version 50 firmware.

Unfortunately WinSwUpd doesn't seem to be able to update the phone back to CX65 (as it says the phone rejected the update), but I managed to install the CX65 FFS and therefore obtained a working T9.
Still the mixup of the CX6V firmware and the CX65 FFS was showing a bit

In order to fix it today I:

• converted a winswupd file into an xbz file using papua
• extracted phone codes (ESN, HASH, SKEY, BKEY) with Px65v4 method in papua
• converted the xbz into a bin file using npm siemens-fw-tool
• made a backup of the entire firmware through x65flasher
• flashed the CX65 extracted bin file with x65flasher

The flashing was apparently correct but now the phone is emitting a small beep but not starting up.

Trying to boot it in "normal mode" on papua gets me and error (phone was switched off on error, EXIT 000C:F7FB, FILE ddsphw, CPSR 60000030, CepId FFFF).

SKEY seems to be wrong even after releasing it and recalculating it so x65flah cannot be used to reflash my backup.

The only software that seems to be working more or less as expected is CX6V winswupd that tells me it has correctly updated the firmware.

Does anyone know if there's any chance of being able to revive the phone? Thanks in advance.