Factory reset is implemented in unpushed builds, however, I am struggling getting FatFS to RELIABLY enter the save folder on the eMMC and write to it. Reading is fine.(it piggybacks onto the Lockpick_RCM section).
Once I have cracked this, full factory reset will be implemented in all releases.
In the meantime, mount in hacdiskmount, BIS key 2, mount system... Look for save folder... delete all apart from 8000000000000120.
If any savemeta present, delete. Ensure placehld is empty...
Optional: BIS key 3 - empty all the folders in USER partition but keep the structure.