Otra más:
He conseguido restaurar mi imei (las he pasado putas )
La solución estaba en el post de xda, lo copio por si le pasa a alguien:
Originally Posted by mohicanrat 1. Connect phone by USB
2. Enter 1809#*990# in dialer
3. Select Port Settings -> Select CP USB
4. Start hyperterminal, in COM settings select same port like in devide manager -> LGE mobile USB Serial Port, 115200
5. Type AT if response is not OK, change port number
6. Type at%imei, it should display your current IMEI
7. Type at%imei=x,x,x,x,x,x,x,x,x,x,x,x,x,x,x , where x,x,x... is your orginal IMEI number
8. Reset
Un saludo