i got no idea, try kindle fire first aid (google it) that and droid wall are the 2 ways peaple usaly block updates. if you got 7.4.6 there is nothing new in 7.4.7 or 7.4.8 i have my moms kindle (7.4.6) and mine (7.4.7, only updated beacuse 7.4.6 broke) and there is no diffrence.