Even though laptop is the same model with exact same specification and Bios version, I see that the DSDT and SSDTs are very different than my laptop. I tried several times but your dumps don't even let me boot into Mac OS, even though it let's into installer.
Meanwhile in the last couple of days I tried making my own EFI from scratch. Everything is working perfectly, but I am finding it troublesome to disable it's dGPU, using SSDT-DISABLE-GPU works but it makes the laptop loose it's fan control, they just keep on spinning on 100% all the time even if I restart the system and get into the BIOS menu, they just keep spinning all the time!
Another method, SSDT to send in the GPU to lower power state, which you used in your dumps simply doesn't do anything for me. dGPU keeps on pulling power.
Can you please suggest what extra I need to do to disable it's dGPU.