My coship CDBV2500E Recivier has 7U on the display and is stuck on one channel , is there a way to reset or default the unit given I can't access the menu either?

SOURCE: DTV locked on ITV1

do a reset in the service menu the turn the tv off and press..

info>menu>mute>power on

and go to the reset option. don't mess with any other setting in this engineer menu.

SOURCE: Samsung LE32N7 - Analogue channels ok - Freeview

This is very common to a number of Samsung models built at the same time as yours and using the same in-built Freeview receiver.

There is no fix, the built in receiver is simply incompatible with the most recent updates to Freeview (as happened to many external boxes) and cannot be modified, the only puzzle is the length of time that your receiver kept going for. If your tv has a warranty still then you may wish to see if the fault is covered.

Without a warranty, all you can do is continue to use an external Freeview receiver. They're usually better quality anyway, and are easy to replace when they go wrong or become out of date.

SOURCE: lost channel connections

Go to the menu and then enter your choice out of them like find channels or scan/scan channels.