Fixing corrupted BIOS on X380 Yoga

[ulisesv]

I have a ThinkPad X380 Yoga that I tried to put a WWAN modem on (Fibocom L830-EB), this modem is supposed to be supported on the laptop (even the FRU P/N matches with Lenovo's part list), but the system wouldn't boot, saying there was an unauthorized network card installed. I tried patching the BIOS to remove the whitelist, but I just ended up bricking it.

Even after flashing my original dump, my machine refuses to boot. I know it's a valid dump because I've checked in UEFITool, and I've already tried replacing the BIOS region on the firwmare using ifdtool, the machine just doesn't boot.

For context, I'd like to add that the first time I tried patching the BIOS (when it did work), I desoldered the SPI chip because my programmer's clips weren't attaching, but now I have new clips that work. I suspect the fact that I desoldered the chip has something to do with it not working now, but I can also confirm the chip is properly soldered in the board (I checked a bunch of times to see if that was it; it wasn't).

[RealBlackStuff]

Remove/disconnect these: charger, batteries (incl. CMOS), RAM, SIM/Smart/LAN/WAN cards, HDD/SSD, anything from the ports.
Press and hold down the Power button for 20-30 seconds.
Insert only the charger and try to boot.
If OK, switch off, unplug the charger and reconnect all of the above.

If still no luck, use e.g. a paperclip to press and hold down the reset button on the bottom for a few seconds.
Let us know what happens.

[ulisesv]

Hi! I tried all this with no luck. My previous symptomps remain (I've uploaded a video to iCloud where you can see how the maching is acting https://share.icloud.com/photos/0d21MBB ... NzVzkKYcPQ).