Here is yet another CH55x programmer with v1 and v2 bootloader detection and support.

This one combines code from other projects:

• vnproch551: https://github.com/NgoHungCuong/vnproch551

  used for v2.3 and v2.4 bootloader support

• libre551: https://github.com/rgwan/librech551

  used for v1.0 bootloader support

• added autodetection routine of V1 and V2 bootloaders

  No need to specify bootloader version or protocol - chprog should figure it out.

Supported are Write, Verify and Reset for all supported bootloader versions: 1.0, 2.3.1, 2.4.0

Tested on:

• CH552T, BL: 1.0, 2.3.1, 2.4.0
• CH551G, BL: 2.3.1

Usage is quite simple:

sudo ./chprog firmware.bin

Make sure your device is connected to USB port on your PC. The bootloader has to be activated by pressing the booloader button (or by shorting the bootloader pins/pads) on your dev board during power-on.