(28-05-2015, 02:05 PM)gursewak chainfire ?? supersu??
author of supersu is chainfire
and u say replace chainfire with supersu.
Which of the root handler app is currently installed on your phone? Kinguser? Chinese superUser? SuperSu? and BTW's there are lotsa variants of the Superuser app. and for clarification, your soice Mi455 is running on gb or ics?