Could be either camera module failure or flexcircuit cable failure, just take it to authorised nokia care, as it is a little bit difficult to replace these parts, or even get them
Registering a Handset
If you see a "not registered" message on a handset, you must register it to a base before using it.
1. On the base, open the menu and select "Register Handset"
2. On the handset, press and hold POUND (#) until the handset display says "Handset Registering" (about 2 seconds).
3. Wait until the handset display says "Registration Complete" (about 30 seconds), then pick up the handset and press eND/CleaR.
# If you don't hear a dial tone or the display says "Registration Failed" charge the battery completely, then try again.
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