@Sunshine Sunshine, thank you for your reply, I'm in Italy and to be honest I don't know exactly how old are the router. i had some problem in my house with internet connection and my provider said...

Dear All, I have start suddenly to face a problem with my Archer D5 V1 router. Every time that I connect to the administration page -> Status I got the error message Error code: 9003 - Illegal value!...