How can i stop my system update while its updatinv?

[AC Question]

My Android HTC Desire is has been running an update for 2 days. How can I stop it while it trying to update?

 

[Rukbat]

Bring it to your carrier's store and ask them for assistance. (Stopping the update in the middle could leave the phone with no ROM - which they'd have to fix. Or ... it may not actually be updating, and resetting the phone will leave you with the phone you had before the update started. Let them take the risk.)