Just wondered if the pmic was outputting correctly, Im used to seeing 1.8v as vccq which is also what I have here, but checking the pmic's ID it's final 3 digits which you clarified on page 1 as the power profile, are different - so its to be expected, my bad.

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alright so i managed to secure the same ssd drive with the same PMIC to verify all voltages are the same. after that i believe there is nothing i can do? nand is encrypted by the controller and you can't replace the controller?

It's not likely that the controller has failed, it's usually the nand and the controller just gets stuck reading it. There's also some serialisation between nand and controller going on with some drives, I don't think anyone has a definitive list and if they have they're not sharing.

If you could trigger safe mode that would confirm the controller health as it breaks the comms between the controller and nand at an early stage. Drop your meter on the test points do any voltages resemble serial communication ?

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i do have a very basic oscilloscope i could poke around, but i wish i knew where exactly to look, there are dozen of TPs that potentially could mean anything

so, ive got some kinda update for you guys:
1. good ssd that i have for comparison is sn530 which is 99.9% same layout and ics. all voltages are same. basically all diagrams that i wrote are correct and applicable for a good ssd and can be useful for anyone who needs. except resistance on that low rail (13 ohm) is 25 ohm but i guess that's still in kinda acceptable range.
2. poked around with oscilloscope - couldn't see any smbus-like communication neither on those 3.3v resistors nor testpoints.
3. tried shorting those resistors 3.3v and that 1.2v near crystal. the only that gave something is that 1.2v near crystal. shorting logic side to ground gives some plausible results probably due to non precise timing on shorting, however it seems shorting until win desktop could do.
anyway here is the pic how i got it "detected". win device manager does not see it or i was impatient. it seems sort of a safe mode as it indeed shows pcie 4.0 x2 mode which this ssd is capable of per spec.

any hope or anything else i could try off before i cremate this xbox?

also any hope if i can leave it overnight powered on to self-test and self-repair as rumors says? does it even applicable to these sandisks?

You've done just about everything you can from the normal procedures.

Might as well leave it with power only for 24 hours so you can rule that out too - although I've not had it make any difference with anything ever. You could also try heating the nand up to around 50c, reflowing the nand /control or if you have another identical drive a controller / nand swap as a last resort, but I think you're flogging a dead horse at this stage.

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so i tried leaving machine for 24h in bios with ssd plugged in. also freezing it, heating it, reflowed nand and controller - nothing.
tried shorting that resistor again and gave machine a reset. after reset unknown device changes to standard nvme adapter. does that mean anything?

Dropping it into safe model only proves the health of the controller, it's a diagnostic test rather than a fix. The only other thing you can now try is to move the nand to another identical working donor drive. I don't think for a minute it will help but you can at least then say you have tried everything.

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I could but aren’t nand and controller paired with some key and data is encrypted? I dont have any pc3000 or anything to tackle that. Seems like a waste of donor ssd

Some are paired, some aren't it's not like a phone where they definitely are. The only real way to know is to test between 2 known working identical donors. It's not a waste if you learn something - or at least that's what I tell the budget troll when I get complaints about the piles of donor drives I buy.

PC3K wouldn't help you it's not a supported drive, we're essentially as blind as you on these. This is the unfortunately reality of data recovery on ssds, a good number just can't be recovered with todays tech.

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here i was thinking that pc3000 is an ultimate tool . anyway. if i will replace my nand to a board with the same controller (maybe i will pick 256gb instead of 1tb) will there be at least a way to know that i got pair mismatch or unreadable nand (initial issue that we suspect) or something else?
what are the chances to get data here in your opinion? 5%? the reason i am asking is that i am not in console repair or data recovery business, i just need to get my stuff fixed. i do know more than average user, but the findings that you say we can learn from it for me personally will be simply discarded/have no value

Ultimate is a bit of a stretch, it does a lot and for older mechanicals it's the dogs danglies. For modern SSD without controller support it's nothing more than a very expensive usb adaptor.

Even swapping the nand wont give you confirmation of the fault (it could still either faulty nand or serialisation) You could try putting the donor nand onto your faulty drive which may narrow it down (if it worked) but the only true way to know about the serialisation would be to swap between 2 known good identical drives.

Chances are never 0% but you've done most, if not all that would be done professionally. Beyond this you're into custom debugging / manipulation of the controller, which having tried myself and failed I now class as above my pay grade.

The best you can do is keep it on the shelf powering it now and then to try and stop it degrading whilst waiting for controller support https://blog.acelab.eu.com/pc-3000-ssd- ... dated.html at which point professional recovery may be an option but the chances of getting a clone to just put back in are so low it may be better just to cut your losses now.

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Lardman, sorry for late reply, I salute you sir for all the support and time you've put into your answers.