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.
A downloaded .hex file will now use the Universal Hex file format, designed to support all micro:bit versions. As such, the resultant file will be ~1.8Mb rather than ~600Kb
MakeCode Editor
- Drag the .Hex file you wish to update into the editor at makecode.microbit.org
- Choose Download to compile the file and save it.
Python Editor
- Drag the .Hex file you wish to update into the editor at python.microbit.org
- 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, universal hex, hex file is 1.8mb, 600kb, hex file is double in size