while updating my nexus 4 suddenly turned off and after turning it on manually on it was just showing this screen. I think the battery was low so it got switched off .four coloured bubbles was just moving nothing happening other than this what to do with this please help....
Welcome to Android Central! If the phone truly shut off prematurely due to low battery during an update, that could be pretty serious--there's a reason why they tell you to make sure you have plenty of battery or keep the phone plugged in during the whole update process.
How long has it been on that screen? Are you able to boot into Recovery Mode and wipe the cache partition or do a factory reset? https://support.t-mobile.com/docs/DOC-5994