1. After welding, check whether there is any short circuit or weak soldering.
2. Short-circuit C, and short-circuit the UDPUDM jumper pad to B, as shown in the figure
3. Plug in the computer and use WCHISPTool to download the control program to CH552E. Select the PMOS version or the PQ relay version according to your own board.
If you don’t know how to use the download tool, please refer to this open source: https://oshwhub.com/TheLight/zi-ding-yi-jian-pan
4. After downloading the CH552E control program, disconnect C and short-circuit the UDPUDM jumper pad to A, as shown in the figure
5. If there is no accident, you can download the program to CH552T normally.
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