While flashing a custom ROM, the risk of an improper install always looms which can cause the phone to go into bootloops. There are several other things that can go wrong while flashing a custom ROM; like flashing an incompatible kernel, corrupt zip package of ROM, etc. It is important to make a backup of your current ROM before flashing a new one.
It is advisable to make a backup using recovery. A Backup make in recovery is often referred to by developers as a Nandroid backup. A Nandroid backup can Restore the phone to its working condition including all the Apps, SMSes, Call logs and other Personal Data. Continue reading