Nintendo forces you to keep your console on a relatively new firmware version to be able to use Nintendo Switch Online Services in-game which allows you to play with other players and access online features. Nintendo Switch Online is a paid subscription which means that Nintendo is forcing you to keep your console up to date to fix errors to have you be able to use the paid subscription.
Background
Nintendo introduces a security check in the Nintendo Switch with microsopic fuses in the switch's CPU named efuses. This security feature checks whether the number of burned efuses match up with the firmware version intended for the number of burned efuses you have. If these two factors dont align the switch will panic and refuse to boot. The Nintendo Switch only has 32 efuses. So far if you were to have your switch be on the latest firmware u should have burned 23 efuses. Everytime you update, a efuse is burned. This efuse cannot be restored in any way and the "simplest" and most cost-efficient way to get back burned efuses would be to completely replace the chip. If you modify your console you can bypass the fusecheck which lets you run any firmware you want.
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