lg g flex 2 dead during google play update

[AC Question]

I have buyed a second hand cell phone that is lg g flex 2 and when i got home i make my google i.d update that cell phone in thr morning it's restart thrice thrn become dead .and no one in KARACHI (Pakistan) markets sellers have those files to recover that cell phone

not only mine lots of people cell phone i.e lg g flex 2 dead during that update from google play same as mine so kindly tell us the way to recover our phones