If you know the original key (rare), you can write it back:
The future of eMMC security is only getting tighter. As UFS (Universal Flash Storage) becomes more common, even these methods will become obsolete. For now, treat RPMB as a one-way street – clean only when you have a verified, factory-provisioning tool in hand and a backup plan for failure. clean rpmb emmc skhynix
"Cleaning" the on an eMMC chip, specifically for brands like SK Hynix , refers to resetting the security partition so that a new authentication key can be programmed. This is common in mobile repairs when swapping chips between devices or repairing "bad health" chips. Understanding RPMB "Cleaning" If you know the original key (rare), you