Another interesting reading: https://tomantosfilms.com/15044/m2-ssd-upgrade-laptop-asus-gl553/ Although it is possible to buy the much faster (4-5 times) PCIe Gen3X4 m.2 SSDs that will fit into the m.2 slot in the laptop, I would not recommend doing...

If you try an M2 PCIe (NVMe) drive on GL553VD as bootable device, this is what you get:https://forums.tomshardware.com/threads/laptop-asus-rog-gl553vd-doesnt-recognize-m-2-ssd.3713728/There was neverending loop with this fail -> automated reset -> fa...

Probably your Kingston SSD is the bootable device.Because is all our tests with GL553VD and various M2 PCIe (NVMe) drives none of them was able to boot.Again, on GL553VD (european 2017 version) only the M2 SATA (or normal SSD SATA3) can be bootable d...

Gen 3 or Gen 4, the M2 PCIe drives do not work on most of the GL553VD (the european versions from 2017).You need an M2 SATA drive (same as the original 128 or 256GB) in order to get a bootable drive.

I've just upgraded them all (with excellent results):1) 128GB M2 to 1TB M2https://www.amazon.co.uk/dp/B08439RNGWBe aware: it has to be M2 SATA, not  M2 PCIe !!!2) 1TB HDD to 2TB SSD:https://www.amazon.co.uk/dp/B0BWXK95PY3) 16GB RAM to 32GB RAM:https:...