Request for unlocking Fujitsu-Siemens Amilo 1546

Hello! Can't flash my bios even with original one, flasher writes "Failed to flash bios image: This bios is not for this model. Bios is not flashable. Error code: -144 ". Some say it's because i've upgraded my video card that is not written in bios as supported (but it works fine!). Tried to flash in windows, in bios with command /forceit, with/without battery, in crisis recovery mode with/without videocard - nothing happens.
Guess the bios needs to be modded for my videocard (Nvidia quadro fx770m) or to disable the videocard check. Could you please help me? Need to update bios as the new one has some important hotfixes for my controller...
Bios attached

  Bios.rar (Size: 501.68 KB / Downloads: 0)