I gather there is a question over whether downgrading sysnand is even possible, and this has made me curious. NAND is just flash memory, so it should be possible to write anything to it. The system clearly already has write access to this (for updating). If a flashcart is used to enable running homebrew, could homebrew software write to the NAND flash? Alternatively, if this wouldn't work, could the flash memory be physically accessed and written to directly? In any case, if there were a method of writing to the NAND would it even work to flash it with a dump of an older FW version?