London's legendary department store Selfridges singled out BlackBerry's new Q10 model as its "fastest-ever selling" technology product at a launch on Saturday, but analysts remain unconvinced that this high demand will help the mobile maker remain relevant in a tough market.

Selfridges said its initial stock of the BlackBerry Q10, the first to include a Qwerty keyboard as well as BlackBerry's new BB10 software, sold out in stores within two hours.