– including the boot partitions (BOOT1, BOOT2) and user data. Use the tool mmc-utils or the programmer's software.
Click . Wait for the progress bar to complete. Do not disconnect power. Step 5: Verification
Look for the option labeled or Repair SK Hynix Firmware .
To perform a write, you must already possess the 32-byte authentication key. Since the key is programmed only once in the chip’s lifetime and cannot be extracted, this method is only useful for provisioning a new key into a virgin (brand new) eMMC, not for cleaning a used one. However, researchers have demonstrated that voltage or electromagnetic fault injection (glitching) can bypass RPMB authentication checks in some chip models, potentially allowing unauthorized writes—but this is strictly for academic and advanced forensic environments, not practical repair.
Navigate to the or Advanced tab in your JTAG software interface.
The (Universal Flash Interface Box) is one of the most versatile and widely used tools for eMMC programming, repair, and security bypass. Starting from firmware version 1.15 and software version 1.8.0.3296 onward, the UFI Box introduced a dedicated feature specifically addressing SK Hynix eMMC chips.
Not all tools support all SK Hynix models. For instance, the is noted as "antigo – não suporta código novo – não mostra contador Rpmb" (old – does not support new code – does not display RPMB counter). Always verify that your specific SK Hynix chip is listed in the tool’s support database before beginning.
Some hardware boxes feature specific bypasses or factory commands built into their software specifically for SK Hynix controllers. Connect the chip to the . Click Identify eMMC . Go to the Special Task menu. Select Clear RPMB or SK Hynix Factory Reset .
Execute the hardware format command via your JTAG software interface to clean the registers. Step-by-Step Guide using EasyJTAG Plus
Your SK Hynix eMMC chip is now successfully cleaned and ready to accept a new authentication key from a different processor. Important Risks and Structural Considerations
Known working flow for some Hynix H26M series (for experienced users only):
If you are currently troubleshooting a specific SK Hynix chip, please let me know the or the log output from your programmer tool. I can provide more targeted steps or help you find the appropriate firmware solution. Share public link
When you connect an eMMC to Medusa Pro II, the software displays the RPMB status clearly:
: Poor hardware connection, incorrect voltage, or mismatched firmware binary.
SK Hynix manufactures various revisions of the same chip models. A firmware file intended for revision V1 will brick a revision V2 controller chip. Always match the firmware string inside the eMMC controller readout, not just the text printed on the plastic BGA shell.