Firmware v1 requires a switch with zero fuses blown.
Firmware v2 requires a switch with no more than one fuse blown and blows the first fuse.
If you install v2, you can't install v1.
Nintendo can make 22 firmware releases that disallow rollback.
Got it. Thanks. For some reason I was imagining a new firmware that some people couldn’t install because they had blown too many fuses.
Got it. Thanks. For some reason I was imagining a new firmware that some people couldn’t install because they had blown too many fuses.