If you find your hex file no longer works with your micro:bit, it could be because modifications have been made to the underlying software that supports the device. 


Try updating your .hex file. which is simply a case of dragging it into the online editor that was used to create it and re-download it.


MakeCode Editor

  1. Drag the .Hex file you wish to update into the editor at makecode.microbit.org
  2. Choose Download to compile the file and save it.





Python Editor


  1. Drag the .Hex file you wish to update into the editor at python.microbit.org
  2. Choose Download to compile the file and save it.




If that doesn’t resolve the issue, please open a support ticket



Additional keywords for search: updating hex