Questions about Routerboot

RouterOS General
1

Hello. My router is RB2011UiAS, so no serial port available.

  1. How can I know which bootloader is currently in use(main or backup)?
  2. Can I downgrade the bootloader, or overwrite it with the same version?
  3. If I’m currently using the backup bootloader, and I issue a upgrade command, will the upgrade go to the main or backup bootloader?
  4. Can I copy the backup bootloader to the main one and overwrite it?
    Thanks!