[REQUEST] Modded UEFI BIOS for Dell Inspiron 15 7567

Hello! I am new to the scene here, and I would like to mod my system BIOS to tweak some thermal and TDP profiles.
However, as I’ve learned, while dumping the BIOS via the command

FPTw.exe -bios -d biosreg.bin

works, the writing of the same unmodified BIOS using this command,
FPTw.exe -bios -f biosreg.bin

does not, spitting out this error:
Error 368: Failed to disable write protection for the BIOS space.
FPT Operation Failed.

I have looked at the guide from @Lost_N_BIOS ,
but it seemed to not work for my case.

If you look at my post in the thread above, I am pretty certain that I followed the steps closely.

Any help on this topic would be appreciated!

**Edit: The BIOS chip is winbond 25q128fvsq, and is accessible easily without disassembly of the entire machine.