- Joined
- Sep 19, 2011
- Messages
- 413
- Motherboard
- Dell XPS 15 9520
- CPU
- i9-12900HK
- Graphics
- RX 6650XT
- Mac
According to the XPS 9350 Skylake schematics (Which I guess are largely identical to our model) floating around the net one has to bridge the service mode switch from PIN 2-3 shorted to Pin 1-2 shorted.
After much schematic referencing I've finally located SW1 (Service Mode Switch) on the board. However, shorting Pin 1-2 doesn't seem to work. The Winbond chip remains locked.
Setting 0x67a-> 01 via IFR allows a full dump, but writing to the descriptor is still disabled. Curious to hear if anyone has managed to unlock the descriptor and/or bridged SW1 successfully, as it may allow for a downgrade from 2.4.2.