Problem with firmware update- urgently help wanted

The only component that will brick the entire vectrix, if a failed firmware update occur, is the motorcontroller. The BMS update will halt if any BMS board is damaged, but the vectrix will resume without problem.

Yes Seirmann, a pair of things:
First, read this x-vectrix post:

This problem has been a PITA since day one, especially with the older diagnostics. The MC uses an older TI processor that does not retain the bootloader code during reprogramming. The architecture requires that all the flash be erased before loading new code. So, during MC reprogramming, the first thing the bootloader does is copy itself to volatile RAM on the processor. The bootloader then begins executing from RAM so that it can erase the entire flash, then load new code. Then it copys itself back to flash. The other issue is that the available RAM is so small that the bootloader code cannot be made very complex or robust. It literally uses every available address of RAM. If one line of code were added, one line would have to be deleted somewhere else. The result is that any glitch in the CAN communication or anything can cause the reprogramming sequence to fail or hang. Sometimes it is recoverable by restarting the diags, but it depends on where it was in the reprogramming process. Turning off the scoot leaves the MC in an unrecoverable state. Once this happens, the only way to recover is to reprogram the MC directly from the JTAG port on the PCB. Its very simple and fast but requires some expensive programming hardware. This puts the code and BL back in flash.
Most newer processors have flash that can be erased in segments. So you can put the bootloader in a protected area and not have to worry about losing it. Also, there is lots of code space available so it can be made very robust.

Secondly, some vectrix were bricked because the Scooterdiag was not properly installed on the computer: An uninstalled program was executed inside a downloaded folder from internet. This faulty program failed to upgrade the firmware properly, bricking the vectrix: ONLY use installed scooterdiag program only.

Third, use a laptop with a good battery, to avoid upgrading interruptions due to aN electric power failure.Oh! and never plug the vectrix and the laptop at the same time, or the laptop will be fried (unless you have a peak canbus adapter with galvanic isolation).
HOpe it helps...