The UEFI ofe the Surface Pro 5 broke due to an automatic firmware update. Thank you MS!
So I did some research and tried everything. In the meantime I desoldered the winbond 25Q128JVPQ UEFI chip and since I don’t have an CH341A adapter I read out the chip with the raspberry pi and flashrom.
I also downloaded the latest UEFI file from microsoft and now i have concerns because of the huge difference in the file size.
Bios has a high level of redundancy, everything stativ there you’ll find twice, in your dump all redundant parts identical (which makes an update failure already very unlikely) and in addition all these volumes are identical to the stock volumes you find in the corresponding stock update file.
Identical volumes/ paddings marked in same colour (both arrows for the paddings were supposed to be purple)
The only thing that happens with the surface is that you see the Windows logo every few seconds and it keeps “restarting”. Looks like it is in a boot loop. And that happend right after the firmware update.
I’ve tried an soft reset, hard reset, USB recovery, I can’t enter the BIOS. When it was opend i disconnectet the battery and tried everything again.
So my last thought was that something went wrong with the update.