Unhappy Phone Won't Boot up (Deleted stock loader) HELP

Hey guys i deleted the Stock launcher by mistake i have another launcher on my phone (g40c/Namgear) it isn't rooted, it has a default root built into the phone it's self but i can't get it to boot up fully, it goes as far as a black screen (looping) is there anyway i can recover my rom? i have a recovery program or possibly install the launcher through my computer using the default wire