Not sure from when but sure after lollipop update my phone is not getting detected when connected to PC via USB. It says unrecognized USB device. Tried mass storage and the digital camera mode. When searching Zenfone forum it looks to be common issue. Please let me know to resolve... Is it hardware or firmware issue. If firmware is there a solution in near future? Please advise. My 1year warrenty gets over soon... So pls let me know Asap