Guys, as one of the few users who rolled back the firmware to 2023 using a spi-programmer, I'll tell you about the specifics of interacting with drivers.
When rolling back the firmware using an unofficial method, "driver jamming" mode is activated. This helps track in detail at which stage each driver is causing a conflict with another driver.
In short, I recommend replacing all drivers with WHQL certificates, if possible. I've personally encountered situations where the same driver revision (digital) but different certificate types worked completely differently. For audio, there was no interference, and for video, no jamming or BSODs. A working driver certificate helped get rid of the "PCI Express device not started" error. And don't forget to roll back to a previous driver version; this is normal; the older the driver, the more stable it is. I use the very first NVIDIA driver from the Windows update catalog.
If you can find an OEM recovery for Zephyrus and the drivers are similar in content, that's a solution. For example, my Strix with Windows 22H2 China Zephyrus has PCI Express configured for 12th gen instead of 13th gen in the registry, and this helps bypass the stupid proprietary driver protection of my 13th gen.
Also, avoid VMD enable + dual boot; some drivers in Windows (1st partition) can cause conflicts between two operating systems and even Linux (Realtek + SmartAmp firmware protection). For severe cases, there's a flash drive with an advanced BIOS; I won't mention the name; it's for enthusiasts; anyone who needs it can find it themselves. Good luck, the driver system in our laptops is very complex! The more complex the system, the higher the chance of catching bugs.
