Manual:RouterBOOT

RouterBOOT is responsible for starting RouterOS in RouterBOARD devices.

Main and Backup loaders

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. It is possible to call the backup loader with a configuration setting in RouterOS:

system routerboard settings set force-backup-booter=yes

it is also possible to use the backup booter by turning on the device, with the RESET button pushed. Sometimes the RouterBOOT receives firmware upgrades. 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. For upgrade instructions, follow the separate instructions in Manual:Bootloader upgrade

Configuration

For RouterBOARD devices that feature a serial console connector, it is possible to access the RouterBOOT loader configuration menu. The required cable is described in the Serial console manual. RouterBOARD serial port is configured to 115200bit/s, 8 data bits, 1 stop bit, no parity. We suggest to disable the hardware flow control.

RouterBOARD reset button

RouterBOOT reset button has three functions:

• Hold this button during boot time until LED light starts flashing, release the button to reset RouterOS configuration (total 5 seconds)
• Keep holding for 5 more seconds, LED turns solid, release now to turn on CAPs mode (total 10 seconds)
• Or Keep holding the button for 5 more seconds until until LED turns off, then release it to make the RouterBOARD look for Netinstall servers (total 15 seconds)

Note: If you hold the button before applying power, backup RouterBOOT will be used in addition to all the above actions. To do the above actions without loading the backup loader, push the button right after applying power to the device.