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game-and-watch-backup
Relatively easy to use scripts for backing up (and restoring) the original Game & Watch firmware.
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InfluxDB
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If you're having trouble getting the 16MB image to flash correctly there could be a few possible causes. Firstly, I'd go back and attempt to restore the original firmware using game-and-watch-backup's 5_restore.sh script (https://github.com/ghidraninja/game-and-watch-backup). If that works, you can assume the flash chip is correctly soldered/working and turn your attention to other parts of the process. In my experience, lowering the adapter speed helps, as well as using short, soldered wires for attaching to the debug port.