Legion 5 Bricked After Incorrect Nvidia vbios Flash

[nikola87]

Hi, first of all sorry if I write badly, but I use the translator,I accidentally killed my Lenovo Legion 5 15ACH6H laptop after flashing a wrong vbios to the Nvidia GPU, I did this because the GPU was already not working properly before he didn't come recognized by Windows, and in desperation I did this and now I am very sorry. So now when I turn on the laptop it remains with a black screen, I can't even enter the bios,I've already tried everything, changed thermal paste, cleaned the heatsink, disconnected the CMOS battery, but none of this solved the problem.The laptop was last rebooted in mux switch off, so it starts by force with the dGpu.
So I was wondering if there is a way to try to reset the bios to default settings, so that it starts with the iGpu, or if there is any other method I can try. Thanks