Do you really know where ifux64.efi wrote the data?


But I don't have the machine at hand and I don't feel any need to discuss this any further. This is what it looks like to me, hopefully for you / maybe I'm wrong and you find another easier solution. Good luck!...

That's an example for an MultiIO- or EC chip- the 128 is the size of the flash memory inside this chip:


That'd be a preprogrammed EC chip.

​​...

Do you still have this 64 kB "EC part" you programmed?

EC firmware is often located in the Multi IO chip / keyboard controller, very rarely has a normal SPI chip. The MultiIO chip is the first thing needed when pressing the power button. If you did corrupt its firmware you're quite dead in the water. So if you programmed something into the MultiIO chip which wasn't an EC firmware, you need someone who is capable to re- program an Multi-IO chip or to replace it with a preprogrammed chip....

Interesting idea. Ever considered that this really isn't EC firmware but bios of your Nvidia graphics? Here's a board schematic for a GK5MP5X v1.1, U8 = GD25LQ80 (btw an 1.8V SPI chip) on the pages for the graphics? Here someone has a NVidia video rom (wrongly named EC) from a comparable machine which is a 100 % bitwise identical to your 1MB backup. That's very rare, corruption does normally not happen this way.

Good luck!

Regarding
"EC_25LQ80CI_corrupt_backup.bin – the clip readout of the EC Chip after the BRICK (from first post)"

Check the file content:



If this really is the backup of the mentioned 1 MB SPI chip it's not even close to being an "EC firmware"....