Z3X is Possible
1) Root
2) BackUp EFS
3) BackUp QCN
4) Wipe EFS
5) Reboot Phone in Mode Recovery Mode
6) Wipe Partition, Wipe Cache, Wipe Data User
7) Reboot Phone Normal Mode
8) Root
9) Write Cert (Unlock or Repair IMEI)
10) Reboot Phone
11) Test Phone (Signal, Net)
12) NO Signal “Only Call Emergency” Write QCN BackUp
13) Phone Done