Stuck in a bootloop

vepar22

Estimable
Dec 14, 2014
4
0
4,510
So was going to change ROM on my gt-i9300,i downloaded new ROM went to the custom recovery did factory data reset,cashe particion wipe,then tryed to install new ROM and it says something like detected system blocked(it's not exatly like that).PLEASEEEE HEEEELP