After 2 dead phone
I have experience... lol
You need root J2 prime (G532G) for unlock or something....
you may stuck on password screen..
if you reset it, maybe it stuck on samsung logo
if you flash stock rom with odin your phone will be dead.
today I solved this problem, I glad to tell you how to do it.
just simple than I think :D
Using root file of this guy : https://drive.google.com/file/d/0B80v4ETBQdQqRDlvTDVOZWJkczQ/view
After root password promt, it's ok
Just Unlock phone with Z3X remember choose ADB.
After unlock success your phone still stuck on password.
Now you can try reset your phone with stock recovery.
if your phone stuck on samsung logo
just flash firmware with odin but just flash only AP, if full flash 4 file your phone will dead.
I use this firmware for my phone, it work. link here: https://drive.google.com/file/d/0B80v4ETBQdQqRDlvTDVOZWJkczQ/view
Hope this help! :D