The Microsoft Lumia 535 (first MS Lumia device ever) was well received by users on a tight budget but exhibited issues with touch sensitivity soon after launch. Microsoft was quick to provide a fix for the single-SIM variant of the phone but those with the slightly more expensive dual-SIM version were left out. But now Microsoft is issuing a firmware update that will bring an end to touch inaccuracies for both the single and dual-SIM Lumia 535. The update also enables Windows Phone's virtual assistant Cortana for Germany, France, Italy and Spain and the ability to add a cellular data toggle to quick actions in Action Center. Check for the update right now and if it isn't there it should arrive...
Source: http://www.gsmarena.com/update_finally_brings_end_to_touch_issues_with_dualsim_lumia_535-news-10678.php
