I can't install Linux on the ASUS ExpertBook B9450FA (BIOS 319): I can't switch from Intel RST to AHCI even though I've modified the EFI PchSetup variable. I need help

«Hello, I tried installing Mint on my Asus B9450FA laptop (BIOS 319). I followed the instructions from Claude and Deepseek, but we weren't able to switch to RST. Additionally, I confirmed that BIOS v319 doesn't offer the ...»