If you are attempting this for the first time, practice on a dead board first. Patience and a steady hand are your most valuable tools.
Accessing the user partition when the OS won't boot.
The communication channel is experiencing noise. Shorten the length of your jumper wires, lower the clock frequency setting in the software to 1 MHz or 6 MHz , and verify that the ground connection is completely solid. stk-l21 isp pinout
Writing incorrect firmware dumps or formatting partition tables will wipe all user encryption keys and data permanently.
Do NOT connect VCC (3.3V) from your programmer! The eMMC is powered by the phone's battery circuit. Only connect GND, CLK, CMD, and DAT0 . Power the phone with a bench power supply or a charged battery (with charger inserted) to provide stable 3.3V to the eMMC. If you are attempting this for the first
Connect your flashing box adapter to the motherboard using the following four primary data lines, alongside power configurations: 1. DAT0 (Data 0)
| Specification | Details | | :--- | :--- | | | STK-L21 (Single SIM), STK-L22 (Dual SIM), STK-LX3, STK-LX1 | | Processor | HiSilicon Kirin 710F (4x Cortex-A73 2.2 GHz + 4x Cortex-A53 1.7 GHz) | | GPU | ARM Mali-G51 | | RAM | 4GB / 6GB | | Storage | 64GB / 128GB eMMC | | OS | Android 9.0 Pie (EMUI 9.0.1/9.1) | | Display | 6.59-inch LTPS/IPS TFT | | Security | Rear-mounted fingerprint sensor, Face unlock | The communication channel is experiencing noise
Tools like EasyJTAG Plus, Medusa Pro, UFI Box, or Riff Box are required. STK-L21 Motherboard Flux and Solder Paste STK-L21 ISP Pinout Diagram (Huawei Y9s)
If using the USB power method, connect the phone's battery and insert a Type-C USB cable connected to a 5V power source.
Fine-tip soldering iron with high-quality flux and low-melting-point solder.