Tuf gaming b650-plus wifi motherboard doesn't show mp600 core xt nvme ssd 2tb as bootable

[Avrael]

Heyo, so a bit complicated problem here. First of all, i had the smart idea to change my windows 10 to my new M.2 4.0 ssd (corsair mp600 core xt 2tb), because its faster and has much more space, and would be generally a good idea. It went about as good as i expected, which is not at all.   

I could install windows on it no problem, as far as i can tell, all files are on it, it shows up in the windows installation window, it seems to install perfectly fine, but i cant boot from it. Then i learned, that in most cases, you just cant boot from a M.2 under most circumstances without changing some things first. Most of which i would guess are changed in windows... which im not getting in anymore.   

Another thing is, i had windows 10 on another, older "normal" ssd first, which after installing windows on the new one, managed to boot, but only into a bluescreen with "PC needs to be repaired". Then i reinstalled windows 10, from the same usb as i used to install on the new ssd, on this old ssd... and since then it TOO doesnt show up in the boot menu of the bios anymore. Meaning, now i have 2 ssds with windows on them, that just wont boot. I fear that somehow, the installation of windows deleted more on those drives then it should have, for instance any way to recognize them as bootable in the bios. HOWEVER, both of them still show up in the bios first page under "Storage information", i can even navigate to the windows-system files on them in the bios, they worked both perfectly before, the new ssd already had 1TB of games on it and worked extremly well, and it seems they both still do. They just dont show up as bootable, the M.2 never did im pretty sure, and the other ssd doesnt anymore.

While i installed windows on them, both had at least 3 partitions on them, the first 2 of which i cant install windows on cause theyre reserved, but windows tells me the partition-order isnt right to install on a GPT drive, which the new one is, i made sure of that, i even converted it ANYWAYS to GPT again with the command promt window you can open in PC repair mode (which i can only access with the usb that has the windows install on it, but at least that), so its 200% sure GPT. Yes i formatted both before the install, and when i delete partitions in the win install window, they automatically come back after i look at the drive again, which i would expect. But i cannot make a partition 1 to install windows on, which is what windows seems to want? Idk anymore.   

Its also not probable that the windows install on the usb was faulty, because i downloaded and installed it from 2 diffrent pcs, both times onto 2 diffrent sticks, so had 4 diffrent installation setups and tried multible times with each of them, if really both pcs AND both sticks somehow managed to mess up the official windows media creation tool, that would be actually impressive. One usb stick is brand new bought this week with 128gb, there is almost no way at least that one is faulty.   

Again, the first time i tried to boot from the old ssd again, it gave me the bluescreen with error 0xc00000e, some windows boot file could not be found, even tho it still had the exact same windows on it that worked before i tried to install windows on the other ssd, and did NOTHING with this one yet. It still somehow got messed up while that happened. Then i reinstalled windows on it in the hope that would fix it, and since then its not bootable anymore too. But also still works and shows up as storage.   

I honestly dont care which i manage to boot up windows from first now, i think its probable i have to make it work on the old ssd first again, to get into windows, to be ABLE to change the M.2 into a bootable device, somehow, havent figured out how. Because i so far havent found a way to make that happen in the bios, even tho multible guides tell me its possible. I cant find the options they mention, and by that i mean they arent there. Its an ASUS motherboard bios, with the newest version, i made SURE of that because i had many problems making that work already when i build this pc from scratch. There IS a SATA config menu, and there IS a NVMe config menu, and both DO show their respective ssd, but i cant change anything in there. In the bios boot menu, already neither show up. In the NVMe menu, all i get are 3 self-test options which arent important, and 2 greyed out other self-test options. In the SATA menu for the other, all i get is the SATA mode, which i read i should keep in AHIC as it was before, and an option to enable SATA6G\_2 Hot Plug for the old ssd, which im not sure yet if i should touch that so i wont for now. Thres nothing about anything having to do with booting in there for me.    

I tried most options in the boot menu too already, enabling and disabling CMS and all its options, changing OS type between Other OS and Windows UEFI Mode, setting Secure boot mode to Standard or Custom, so far nothing made the ssds show up. The only option that seemed important in the boost config menu was "AMI Native NVMe Driver Support", which also didnt do anything changing it, the M.2 still shows up in the storage information after changing that, which suprised me a bit, but no matter i think.   

I will continue too look up all guides i can find, but because that likely will take days, i might as well ask here and hope for a miracle. Im sure if i go to a PC shop with my old ssd and make them put on a bootable windows on it, that would fix most problems, but i ofc dont wanna pay money for a problem i can fix myself. And i fixed so far all problems i had with any PC even tho im pretty stupid with PCs as i would see myself, and all problems were worse then this i felt like. Sadly, its sometimes the "easy" problems that get real complicated real fast. With most other problems i could at least access windows and work from there...

Sorry for this very long post, but i want to give as much information as i can and probably still havent given enough. Im now half a week without my pc and its getting really annoying getting nowhere by myself. 

I posted this already in 2 other forums, what I also did since this is fully removed and reinserted the M.2 ssd, reset the motherboard by removing and reinserting the battery, and updating the bios AGAIN to a version that was actually newer then mine because updating that was a few months back now. Nothing did anything, what a surprise. No new options in bios either, it seems to be exactly the same as before. If this is a bug or other mistake, the update didn't fix it. 

[Avrael · Accepted solution]

Very, VERY long story short, ssd missed firmware, so worked physically but would never have been able to boot, I could not replace or update this firmware, so it has to be replaced, the end. Motherboard works fine. 

This can closed now, I'll just leave it in case someone needs it.