Switch not booting past Nintendo Logo

[MizuhoChan]

It's a 2017 unpatched version that I bought on ebay as "no power". It definitely does have power, as I can boot into RCM, but I'm not too sure on how to fix it.

Basically, it will only boot to the Nintendo logo normally, but if you remove the eMMC module, you can put it into RCM mode, then insert the eMMC again afterwards to have access to it, so it doesn't seem to be a hardware issue. I'm guessing whoever had it before has bricked it in some way.

I tried to follow a rebuild NAND from scratch without the prodinfo and such, but even with a new eMMC from another switch that has been fully rebuilt, as far as I can tell, it won't boot.

Has anyone encountered this before? Is it normal that a corrupted eMMC would stop even RCM from being available?

 

[BaamAlex]

Is it normal that a corrupted eMMC would stop even RCM from being available?

No because the rcm and the emmc has nothing to do with each other. That's the good thing about the rcm, you can't "brick" it.

 

[MizuhoChan]

No because the rcm and the emmc has nothing to do with each other. That's the good thing about the rcm, you can't "brick" it.

If I remove it though, only then does the RCM work.

 

[impeeza]

It's bricked, try to boot on recovery mode or follow the tutorials about recover a switch without a backup

 

[MizuhoChan]

I've tried both, the switch will only boot the Nintendo logo, then turns off instantly, unless I remove the eMMC, so I can boot into RCM. I tried to set up the NAND on an eMMC from another switch, following a YouTube tutorial, but it still won't boot.

I was hoping someone would know about how the eMMC stops it from working, I feel like that is quite important, as Hekate says the health of it is 100%, so it's probably not a hardware issue as it happens with three different ones.

 

[BaamAlex]

If I remove it though, only then does the RCM work.

That's normal. Removing the emmc chip or use the jig are the ways to enter the rcm.

 

[MizuhoChan]

Ah, I wasn't aware of this.

So I've tried updating the firmware via tegra to both 13.2.1 and 14.0.0 as when I restored the backup it was on 10.0.2 or something similar, but the fuses are at 16, which is apparently 13.2.1, which is why I tried that.

Even then, nothing happens once I try to boot it, sometimes I got the Nintendo logo, but usually it's either a black screen or the atmosphere icon when I try to boot cfw instead of stock, then the black screen.

I find this very bizarre, as when I dumped the prod.keys and the prodinfo, they both seem to match the switch, with the keys being able to decrypt via NxNandManager and the prodinfo having the correct serial number.

If I enable autoRCM, then I can boot it without having to remove the eMMC too, so that, plus it's working and reading 100% and the other two eMMC's I have do the same, says it's not the hardware itself, but likely software.

I honestly have no idea what else to try, I feel it can be fixed, but I have no idea how.