Connect the battery (or apply 3.7V via DC power supply).
Performing an ISP modification requires specialized hardware and micro-soldering precision. Do not attempt this without the following gear:
Clean the target area near the eMMC/UFS shield using Isopropyl Alcohol (IPA). stk-l21 isp pinout
EasyJtag Plus, Medusa Pro II, UFI Box, or MiPi Tester. Jumper Wire: 0.02mm insulated copper soldering wire.
Huawei, like many manufacturers, considers ISP points as . They are absent from public schematics to prevent unauthorized tampering and to comply with security policies. The points listed here are crowdsourced from successful repairs in third-party service centers worldwide. Connect the battery (or apply 3
The synchronizing timing signal output from the master hardware box to regulate data flow rates. 2. Power Supply Lines (Voltage Regulation)
When the download mode is corrupted and the screen stays black, you can’t use ADB or Fastboot. Your only lifeline is . EasyJtag Plus, Medusa Pro II, UFI Box, or MiPi Tester
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. HUAWEI Y9 PRIME (STK-L21) ISP - EMMC&UFS
If you chose the USB trick for power, plug the Type-C cable into the phone. Click or Check eMMC .
Under a microscope, identify the and GND test points. These are often located under a layer of conformal coating, which needs to be carefully removed. 3. Soldering the Jumpers
Unable to remove Factory Reset Protection (FRP) through software, or the phone is stuck in a bootloop and won't enter Recovery Mode. Partition Table Failure: Corrupted GPT or eMMC partitions. Huawei STK-L21 ISP Pinout Diagram (Kirin 710)