mmc extcsd read /dev/mmcblk0 | grep -E "MANCID|PRV|RPMB"
Cleaning RPMB on a patched SK hynix eMMC is a surgical procedure. It’s no longer a simple dd if=/dev/zero job. The manufacturer’s patch deliberately blocks you, and bypassing it requires either a kernel with non-standard patches or low-level MMC host commands. clean rpmb emmc skhynix patched