

Consequences are either you will no longer receive any network signal or may also result in making your device unrecognizable by your carrier. Sometimes, the process may hit the EFS partition and ends up corrupting the information within.

But in the real world, there is nothing that can actually be called as controlled domain. Usually, the EFS partition is extremely guarded and being located in the root file system, this partition is untouched by the process of rooting or flashing ROMs. Why it is important to backup EFS before root or flashing ROMs?
