A tool for patching Game Boy Advance ROMs that use the 512K FLASH or 1M FLASH save type for certain repro cartridges with a custom FLASH save type chip.
The Windows executable is available in the Releases section.
Drag & drop your ROM file onto the executable or run it from terminal with the ROM as the first argument.
Compatible cartridges all seem to have an epoxy blob in the upper right corner of their circuit board and look similar to this:
