@Sh34fy I'm sorry to see you're having problems with your broadband extender 600 equipment. I'd recommend you get in touch with the helpdesk as they may have some alternative suggestions to try.
By phone: 0808 100 6116
Monday to Friday 9.00am to 5.30pm
Saturday 9.00am to 2.00pm
By email: firstname.lastname@example.org