stuck in b830 android 5.1 - emui3.1

i have updated my p7 into B830 ver

befor that update my phone has this no b158

first i go to b619

scend i go to b830

now this b830 has many problems and i want to rollback to B619 or B158

i try to use three buttons method but it's go in error

and tried loacl update but the same problem

my phone not rooted and bootloader is locked

what should i do ??
any one can help in this
or leave it in B830 and wait another upgrade to solve facebook and youtube and many other problems in this rom

please use sample words i am not good in english:confused: