Internal supply lines (typically 2.8V and 1.8V). Note: Most technicians choose to skip soldering VCC/VCCQ, opting instead to power the board naturally via a standard USB cable connected to a PC or charger. Step-by-Step Technical Execution Guide Phase 1: Disassembly and Shielding Access Power down the device and extract the SIM card tray.
If you need help resolving a specific error or configuration during this process, let me know: Which are you using? What specific error log or code is the software displaying?
EasyJtag Plus, Medusa Pro II, UFI Box, or MiPi Tester.
The line responsible for transmitting controller commands and initialization tokens to the flash chip. stk-l21 isp pinout
Use the Write Partition function in your software. Load the previously extracted partitions from a full stock firmware (Huawei’s UPDATE.APP extracted via Huawei Update Extractor).
High-magnification stereo microscope or digital inspect camera (necessary due to component density around the Kirin processor). Flux: High-grade, no-clean tacky soldering flux. Step-by-Step ISP Execution Protocol Step 1: Motherboard Disassembly Power down the device entirely.
Power down the phone and carefully remove the back cover and internal screws. Extract the motherboard completely from the mid-frame to prevent heat deformation of the plastic components. You must carefully cut or desolder the small section of the metal EM shielding covering the area immediately surrounding the eMMC/UFS storage chip to expose the microscopic traces. 2. Micro-Soldering the Jumpers Internal supply lines (typically 2
Can be soldered to any large gold-plated ground pad or the metal shielding of the motherboard. 5. Power Lines: VCC and VCCQ To power the eMMC during programming, you have two choices:
Connect the other ends of the wires to your EMMC/UFS box (e.g., EasyJTAG Plus) using the UFS ISP adapter board. 2. Establish Connection Open your box software (e.g., EasyJTAG Software). Select the appropriate protocol (UFS/EMMC). Set the voltage (usually 1.8V-2.8V VCCQ). Click or "Connect" . 3. Read/Write Data Once connected, you can now: Dump Firmware: Read the current (broken) firmware.
The bidirectional control line that carries device commands and response tokens from the controller. If you need help resolving a specific error
Huawei USB COM 1.0 Drivers installed on your computer. Step-by-Step Procedure: Using STK-L21 ISP Pinout
📱 Huawei Y9 Prime 2019 (STK-L21) eMMC ISP Pinout for FRP & Service Repair