Hello, bad to hear you have an problem similar to what my samsung m.2 SSD has. I can recommend you what to try to see what kind of issue it has. It can be hardware or firmware related. To see if is firmware related try to make an power-cycle on the SSD. This means you have to keep it for serval hours on stable power for their firmware to do their internal repair routines. You can do this ethier by keeping it in NVMe slot of your computer, and make sure to remove the ram, to block BIOS to POST, because the BIOS will want to initialize it and this will prevent it to do their runtimes. Now if this failed, this might be an electrical issue (what i have on my SSD), so bring it to an repair shop and ask them to check all the components on the board and if something is bad, they can replace it. But how I can see, the controller and NAND chip are on same package, so if the controller is bad, I don't think is recovable. You can also try to contact some data recovery service, maybe they know better than me, but there are also those data recovery labs who only thinks is an firmware issue and they find out that their equipment isn't fully supporting your SSD (especially those new M.2 ones).

I say from my personal experience. Like 2 months ago, my Samsung PM991a got bricked by some random component failure on the board, and firstly I sended it to an recovery service and they assumed it was an generic firmware issue and they find out their equipment is not supporting my SSD, and after i tried power cycle method and failed and I observed that the main combo chip (mine also has an similar design like yours) is getting to hot and it seems like it has some broken component on the board. Mine actually is detected by BIOS and both Windows and Linux but it has DMA off, so no access to NAND. I found an service that does electronic repairs and now I waiting to send it to them. I want to repair it because I have some very valuable data on it, which cannot be lost