Do SPI backups become obsolete with FW updates?

Ondrashek06

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So if I cannot homebrew my switch, I'm at least having some fun with joycons using joycon toolkit.

Let's say that I have backups of both the left and right joycons, both of which have firmware 4.19 flashed on them.

Nintendo distributes a switch FW update which also comes with a joycon update to, let's say, 4.20.

Could I restore SPI backups from FW 4.19 on a FW 4.20 joycon? Would that flash FW 4.19 on it, essentially downgrading it or will the FW stay?
 

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