The threat actor, known as BlackTech, has “compromised several Cisco routers using variations of a customized firmware backdoor,” the agencies said in the advisory. The hackers have been known ...

The safest way to perform the firmware upgrade is to use a wired computer. DO NOT power cycle the Router during the firmware upgrade process.

The safest way to perform the firmware upgrade is to use a wired computer via web UI or Cisco Connect Setup tool. DO NOT power cycle the Router during the firmware upgrade process.