How to: Update/Upload firmware in the Xiaomi Modchip.

Tools:

You need the following:

Open STM32CubeProgrammer:

Press open file (Next to device memory) And navigate/load to the correct HEX/ELF file.

Connect/Solder/Use pogo-pins to the ST-link with the following pinout:

Plug in the ST-Link (sometimes you need to perform an update of the programmer itself. Just follow the onscreen steps)

Now press connect

Now press the Blue Download button. This should start the flashing.

Igor says:

March 3, 2022 at 11:48 pm

Hello I have problem get live this project, I cant connect with ST-link over test points, if I solder back to bluepill it work normally, and I can connect and flash firmware, but if I bring it back to mod PCB it not work, I have asemble three boards but still no luck bring it to live. If I flash in bluepill and get back to mod pcb still not work, I have 3H. Any tips what I can try or messure. I use v1.0 firmware. thanks

Reply
1. admin says:
  
  March 12, 2022 at 9:38 am
  
  Please check 3v3 on all pins on the MCU. I made a mistake in one version of the PCBA’s so maybe you’ve ordered an older version. You can fix it by doing this:
  Solder a small wire between R3 and R4 to the top of C2/C1
  
  Reply
  1. Igor says:
    
    April 3, 2022 at 10:47 am
    
    Yeah it is 3V3 missing track, I repair it with little wire from TP2 to caps positive now it’s working thanks.
    
    Reply
    1. admin says:
      
      April 4, 2022 at 8:40 pm
      
      Hey Igor, Thanks for confirming! I’ve changed the gerbers on Github to prevent this.
      
      Good luck with your Modchip ^^
      
      Reply