• The easiest method to ensure a completely clean router is to run the CLI command

/system reset-configuration no-defaults=yes skip-backup=yes

• Or, from WinBox: System > Reset Configuration
• Setting up the bridge and assigning an IP address are straightforward processes:

/interface bridge add name=bridge1
/interface bridge port add interface=ether2 bridge=bridge1
/ip address add address=192.168.88.1/24 interface=bridge1