well that was worth the read, thank you for the effort put into it, I was able to follow the list and got synced with out to much trouble.

 .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Step 4 - write changes to BCM permanent memory
Put the key (that was used to start the session) into ignition lock (MUST be same RFID as Step 2
interesting, but what is BCM and RFID RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar

BCM means Body control module - Typically in a car the BCM controls the power windows, power mirrors, air conditioning, immobilizer system, central locking, etc. The BCM unit is probably under one of your front seats, at least it is on a 2006 RH drive car.

RFID means Radio Frequency Identification, which is used for car keys to let you start the car, this uses the transponder in your car key. ( Passive RFID system ) Same as credit cards, security tags on store products.

Glad you are now sorted.

thanks RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar