power LED blinks constantly in SXT lite5 AC antenna

Good morning, I have a big problem with a SXT lite 5 AC antenna, I turned it off one day and it was plugged in again today. It is impossible to access it, there is NO activity on the port, the POWER LED blinks constantly and there is no possibility of RESET with 5 seconds, 10 or 15 or pressing it for 2 minutes … I did not find any similar topic. .. I would appreciate it if you can help me