[Q] Lenovo ideapad K1 bricked while flashing

Hi everybody, i would appreciate if any can help me to get my son's Lenovo iDeaPad back
originally device had Android 3.1.x but i want to upgrade it to a higher version. found a handfull of ROMs online but i picked the official upgrade at Lenovo webite.

I followed their PDF file to the letter but for some reason flashing stopped at some point while sending a file to device. after more than 30min i decided to unplug K1 pad and tried to re-do the whole process again.
plug K1, push it to recovery mode (2 LEDs light at home button are on) and windows detects it (under device manager, it shows NVIDIA USB boot-recovery driver for Mobile devices). BUT, once i start Flash.bat (or any other flash file), windows loses connection to device .. NVIDIA USB driver disappears and i had to unplug K1, turn it off and push i back to recovery mode for windows to detect it again
Running the nvFlash commands one by one i noticeds once nvflash command try to start, driver disappears and i get error "USB device not found" !!!! any idea would help, thanks to you all

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