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Nintendo Wii U
Using NAND-AID to repair a broken eMMC (fix 160-0103 system memory error)
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<blockquote data-quote="SDIO" data-source="post: 10395246" data-attributes="member: 636278"><p>I can't see signsof eMMC corruption in the logs. But I think it still wouldn't be a bad idea to run the MLC Checker in the recovery, so all files get checked for corruption.</p><p>Also doing a mlc backup and looking for errors / retrys would tell if all sectors (even the ones not used rn) can still be read.</p><p></p><p></p><p>For UDPIH to work the console needs to boot far enough to be in the right state. If you do heavy writing like an update, it is possible that a write only partially overwrites a flash erase block (which is much bigger than a logical sector). If that happens the eMMC needs to read the rest of the erase block back. But if the ECC checks fail on that readback, it won't be able to complete the write. Writes are cached by SCFM on the SLC and the write out will happen some time later. If it hits such a bad erase block with a partial write, you won't get an error, SCFM would just hold the console, which looks like a freez. On the next reboot SCFM would try to repeat the write and if that fails agan, you won't even get a picture because SCFM is one of the first things that init. Long before UDPIH can work...</p><p>Also the eMMC could just say: There are too many errors, I am out off spare blocks, I go read only completely. That would have the same effect.</p><p></p><p>Since ISFShax already exploits boot1, it runs before the OS and before SCFM can crash anything,, thus giving an entry point back in.</p></blockquote><p></p>
[QUOTE="SDIO, post: 10395246, member: 636278"] I can't see signsof eMMC corruption in the logs. But I think it still wouldn't be a bad idea to run the MLC Checker in the recovery, so all files get checked for corruption. Also doing a mlc backup and looking for errors / retrys would tell if all sectors (even the ones not used rn) can still be read. For UDPIH to work the console needs to boot far enough to be in the right state. If you do heavy writing like an update, it is possible that a write only partially overwrites a flash erase block (which is much bigger than a logical sector). If that happens the eMMC needs to read the rest of the erase block back. But if the ECC checks fail on that readback, it won't be able to complete the write. Writes are cached by SCFM on the SLC and the write out will happen some time later. If it hits such a bad erase block with a partial write, you won't get an error, SCFM would just hold the console, which looks like a freez. On the next reboot SCFM would try to repeat the write and if that fails agan, you won't even get a picture because SCFM is one of the first things that init. Long before UDPIH can work... Also the eMMC could just say: There are too many errors, I am out off spare blocks, I go read only completely. That would have the same effect. Since ISFShax already exploits boot1, it runs before the OS and before SCFM can crash anything,, thus giving an entry point back in. [/QUOTE]
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