Referred to manual- did all it suggested. Anyone else ever run up against this. Changed battery out today in key set and tried my backup set of keys. Any help would be appreciated.

Previously owned '88 Classic and a '06 RR HSE. I am now looking to return to the Rover family w/ a CPO purchase of a 2010 RR HSE "LUX" or possibly RRSC. I come to you all seeking advise on what to look out for....likes/dislikes...MOST importantly...as an experienced RR owner...what are the...