In This post we will share the tested eMMC ISP pinout diagram for your Realme C75x RMX5020, which may be useful if you are doing work on this phone that requires access to the ISP test points, such as removing the FRP lock, removing the MDM lock, flashing firmware, or fixing a dead boot with Flash64, Easy JTAG Plus, or UFI Box.
This section provides the technical details for interfacing directly with the EMMC chip in the Realme C75x using the appropriate tools and connection points.
What is ISP pinout?
ISP in system programming allows us to have direct access to the eMMC/UFS memory with the device still soldered to the PCB (printed circuit board) using an appropriate box/dongle, such as Flash64 UFI, Easy-JTAG, or Medusa.
By using the ISP pinout, we can perform operations such as a full dump, firmware update, boot repair, FRP removal, and security backup without riski a chip-off procedure. That way, we reduce our time, costs, and risks of damaging the PCB
Realme C75x RMX5020 ISP Pinout EMMC Ways Image:
Remove the back panel carefully. The glue will be robust because the C75x has high IP ratings (IP68/69). Take care when using a heat gun and cutting tool. To view the eMMC/UFS chip area, remove the motherboard shield.
- CMD – Command line
- CLK – Clock signal
- DAT0 – Data line 0
- VCC / VCCQ – Power supply for the EMMC (can be powered via USB)
- GND – Ground connection
Tip: Use a microscope or a 10x magnifier to identify the points correctly. Don’t rely solely on diagrams—confirm the layout visually.
Required Tools for ISP Pinout:
- Make sure your bench is set up with the right tools before jumping in:
- UFI Box, Easy JTAG, or Medusa Pro
- 0.1mm – 0.3mm jumper wire
- Fine tip soldering iron
- Isopropyl Cleaner (IPA 99%)
- Soldering flux
- Multimeter (for checking continuity)
How to Connect Realme C75x RMX5020 ISP Pinout to the UFI Box
- Remove the battery from the phone—this is extremely important to prevent voltage problems.
- Clean the PC board area using isopropyl alcohol.
- Connect jumper wires to CLK, CMD, DAT0, GND, and VCC with care using solder.
- Connect the wires to your EMMC tool following the tool’s pinout.
- Double-check each wire using a multimeter to ensure there are no shorts.
- Turn on your EMMC tool and scan the chip in software.
If you have the right connection, you will see EMMC chip information in the tool window.
