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I own a 800g3 dm 35W, with a fully working sn750 500 gb nvme. I'm trying to upgrade it with a new nvme 2tb pcie gen.4 (i know it should work only at gen.3 speed)

When i change the ssd, The PC do not recognize it (bios chenge hdd status to "no hdd"), but i can see the ssd in the boot menu, and can test it (result no error found). i can even install a OS on it. 

When i reboot the PC, it stucks to PC secure boot.

Sometimes - after a long while - PC enter into the bios. When this happens, no SDD in boot menu. Even HDD test says "no drive found"

In other forum, i read that someone put 980 pro samsung in the same PC sff, fully working.

Anyone can help?

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