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For upgrade instructions, follow the separate instructions in Manual:Bootloader upgrade RouterBOARD reset button

It is only possible to upgrade the main RouterBOOT, so in case of failure, you can use the backup booter to start the device and downgrade the main loader. Sometimes the RouterBOOT receives firmware upgrades (see Changelog). It is also possible to use the backup booter by turning on the device, with the RESET button pushed. System routerboard settings set force-backup-booter=yes

It is possible to call the backup loader with a configuration setting in RouterOS: By default, the main loader is used, but RouterBOARD devices also have a secondary (backup) bootloader, which can be used in case the main doesn't work.