Hi! I broke my SP5 display, so I need to open up this cr… tablet. Now, at this situation I think I should reconsider a full maintenance such as battery replacement… etc and, that includes a UEFI downgrade in order to apply some undervolt (since newer versions prevents us from doing it, and sometimes this tablet looks like it came from Mordor).
I have a CH341A programmer, but I dont understand anything c’: (kinda frustrating but i think theres no material about downgrades too). So in the 1st place, can we downgrade using a programmer?
You can see that you have 4 Efi volumes and 1 non- empty padding, all are duplicate in the working firmware and need to be exchanged. In addition it might be useful to delete parts of the NVRAM (EfiSystemNvDataFvGuid).
In addition it might be useful to clean the ME region according to
But this may make you loose your touch.
Please post the complete and unchanged output of MEInfo from this package
The 2 roms I posted before were a generic update image file. I should post an entire dump from my Surface, right? Is there an utility to do that? Or better use the CH341A way?
The last capability can’t be configured in FIT, it has to be enabled by fpt command wjile the machine still is in manufacturing. That’s why I asked.
Otherwise sad to hear, but you saved a lot ot time bricking it just in the beginning. You might’ve kicked a small / microscopic smd part from the board when working with the clamp or when dismantling. Non responsive chip or reading just FFs is often bad positioning of the clamp.
