Wow, didn't notice that for some reason, my bad. But this issue I mentioned then.. you can't access the eMMC as internal storage, and by what you're saying, that flash is totally fine then. I also found MN6840 instead of the NOR, and I areadly found what it is from a reply you did to sandungas:
"Yes, the "Starship 2" controler is a kind of NOR emulator from dual NAND. It seems to manage the bus conversion, NANDs ECC, scrambeling...
And yes, the MN66840 seems to do something similar with the KLMAG2GE4A-A001 eMMC. (Southbridge is the same for NOR and EMMC).
However, I don't think we can access the eMMC via the MN66840 like a regular NOR (like we can't access the NANDs via the Starship 2)."
Anywways, thanks for the clarification.
I never experienced that issue myself but I imagine if too much sectors are damaged on the hdd partitions on the eMMC, the only way is to install a phisical HDD.
Just assumption but the hdd partitions are the most stressed for write operations (specially with 12gb space only, you must install/uninstall games often) . Compared to flash or eflash where the data are almost read only exept for firmware update or settings record (xregistry).