Notice
1. Ctrl mode upgrade is designed for disaster recovery
2. If system prompts “send download request”, you have to follow these monitor mode upgrade steps.
1. Connect console cable to the switch
2. Connect Ethernet cable to the first copper port or MGMT port (phycial port doesn't linked up until data transfer start, you also can not check ping connectivity during this process)
Note: disable windows fireware during the whole upgrade process.