Bangle that came with SMA-Q3 Firmware

I'm going to try and write this up properly at some point later, but I just reflashed a Bangle.js 2 using a cheap dongle.

• Got a DAPLINK (CMSIS-DAP) dongle from amazon. I got mine from Amazon UK but this one on Amazon.com seems the same and costs $8 (with USB-C cable) : https://www.amazon.com/DKARDU-Replaces-downloader-Emulator-Interface/dp/B0BGQZHL75/ref=sr_1_5
  
• Found an old USB socket and wired up to the dongle as in the picture:
  
  • GND -> GND
    
  • DATA+ -> SCK
    
  • DATA- -> SWD
    
  • 5V - don't connect
    
• Then plugged the Bangle.js charge cable into this
  
• Install OpenOCD from https://github.com/openocd-org/openocd/releases/tag/v0.12.0 - you just need to extract the tar.gz file to a directory on your windows PC
  
• Download the espruino_2v21_banglejs2.hex hex from this post, into the directory you extracted OpenOCD to
  
• Open Windows command prompt/powershell in the OpenOCD directory
  
• Type .\bin\openocd.exe -d2 -f interface/cmsis-dap.cfg -f target/nrf52.cfg -c "init;nrf52_recover;exit" - this will erase the Bangle's flash and remove the write protect bit
  
• Type .\bin\openocd.exe -d2 -f interface/cmsis-dap.cfg -f target/nrf52.cfg -c "init;reset init;halt;program espruino_2v21_banglejs2.hex verify;reset;exit" to write the new firmware. It'll take a few minutes and does't say a great deal - just leave it and try not to knock any of the cabling while it's flashing or you may have to restart
  
  

And that's it, you're done!

I haven't tried it but I think @fanoush mentioned that the really cheap STLink USB programmers might be more of a faff to get working - but it looks like the 'CMSIS-DAP' dongles are almost as cheap and work out the box

2 Attachments

• espruino_2v21_banglejs2.hex
•