The specific pinout configuration for the Huawei STK-L21 may vary depending on the device's hardware and software configuration. However, a typical ISP pinout for this device might include:

Y9 prime 2019. ( stk-l21) Back to life ( Dead boot) Thanks for dumb

Technicians utilize these pinouts when software-based methods like FRP (Factory Reset Protection) Bypass

The (commonly known as the Huawei Y9s or Y9 Prime 2019 ) uses an In-System Programming (ISP) pinout to bypass advanced security locks or recover data directly from the eMMC storage. This process involves soldering thin "jumpers" to specific points on the motherboard to interface with repair tools like UFI Box or Easy JTAG Plus . Essential ISP Pinout Points

(Note: On some MediaTek devices, you may also need the VCC and VCCQ lines, though many modern boxes handle power injection automatically.)

You cannot flash it via USB if the CPU isn't communicating. So, what is the solution?