I've just replaced the M2 SATA drive with a 1TB Kingston NV2 PCIe 4.0 NVMe M2 drive which appears to be compatible. Am restoring the Windows 10 installation at he moment with Macrium Reflect 8 off a restore USB stick. All went well. Kingston NVMe drive works well. Nice and fast also.

WARNING, WARNING WILL ROBINSON!!

Before you remove the lower case, you MUST remove the HDD as it is attached to the lower case. If you pull the lower case up with HDD still attached you will rip the HDD cable off the motherboard. So ...

Unscrew the HDD hatch.

Pull HDD hatch on lower right off carefully.

Unscrew the four black screws holding the HDD assembly to lower case.

Carefully pull the HDD cable off the HDD (careful here, you could rip cable off motherboard).

Carefully pry HDD assembly upwards (with spunger) and remove HDD.

Now proceed with rest of remining steps.

Would someone be able to attach photos to these steps. I don't have the ability to do so, easily.

WARNING, WARNING WILL ROBINSON!!

Before you remove the lower case, you MUST remove the HDD as it is attached to the lower case. If you pull the lower case up with HDD still attached you will rip the HDD cable off the motherboard. So ...

Unscrew the HDD hatch.

Pull HDD hatch on lower right off carefully.

Unscrew the four black screws holding the HDD assembly to lower case.

Carefully pull the HDD cable off the HDD (careful here, you could rip cable off motherboard).

Carefully pry HDD assembly upwards (with spunger) and remove HDD.

Now proceed with rest of remining steps.

Would someone be able to attach photos to these steps. I don't have the ability to do so, easily.