Hello and Welcome to justanswer...
I take it to be sure, yours has the auto / electric operated handbrake and not the "standard everyday car" handbrake ( or as earlier models)... I will work off that from what you say.
IF you have carried out the re set procedure as per handbook instructions and you have carried them out to the letter- then you will have one of two faults here... either you have an ecu problem ...(control problem in the system ) ...or the handbrake may be frozen on. You will know if the latter is a possibility depending on what weather you have where you are.. I have seen this before so its not as far fetched as it seems.
If the latter is the case - other than getting a garage out to sort it for you at the side of the road ..its just a case of waiting for it to come off - and keep trying it through the day..
If its the former....then , again, assuming the reset procedure was done...and it may be worth trying that again.... but after that... disconnect the cars battery ... ( have the keys out of the car ) ... then hold the two battery terminal connectors on the ends of the cables together for five mins... ( the cable connectors NOT the battery ones ) ... this will clear out residual memory of the control functions.... Then, disconnect the two cable ends ...leave the battery off for a a further thirty minutes and then reconnect the battery -- and retry everything.
Hopefully this hard re -set procedure will work for you- it often does.... and that will be that.
IF not - then 'm afraid you have no other option but to have the car connected to a dealer level diagnostic machine to see whats gone wrong.... this can either be a dealer or a local Independent jag specialist....but it will need to be dealer level equipment for this.... but try all the above first and hopefully that will work for you today.
I Sincerely XXXXX XXXXX have helped you - Please ask me if you need more help...
Kind Rgds,.... MIKE
PS...Please press the ACCEPT button if you are happy with my answer/advice given- as thats how I get paid ;)
Feedback is always appreciated too... Thank you .
Excellent- Im very pleased to have been able to help you....
Can I just ask exactly what the fault was with it / which method cured it?
Best rgds... MIKE