Question Want to flash 10B on 10C but phone.android crashes.

I was using Eu open 10B ROM and flashed 10C INDIA ROM - Since I did not recognize any improvement I wanted to go back to EU OPEN ROM nut if I flash any 10 A or 10B ROM phone.andoid crashes and does not start. I have to turn of the phone and reflash the INDIA 10c.

Any solution?