You can repair Gd90 with Ghost3D software USSW 6.5.
For me this soft always work - newer f*** up any Gd90 (ver. >=13).
Choose: Restore From Backup and follow instruction.
Mail me if you need some backups.
Remember: use backup from phone with Intel flash to phone with Intel flash
.
Sometime you must quickly remove and put back battery.
BR