mkuu fanya hivi
nenda setting then about then software update then check update kuna message ita pop up click wifi setting then chagua ku update kwa mobile data halafu cheki update.
kama ukiona hupati update google kama nchi nyengine wamereceive hiyo update.
kama wamereceive nchi nyengine idownload hiyo jelly bean ya simu yako then google software inaitwa odin zima simu then iwashe kwenye downlod mode (hapa simu zinatofautiana google kwa njia sahihi) click pda kwenye software yako ya odin halafu locate file letu la jellybean then simu yako itaflashiwa na jelly bean.
apart from that ni risk kueka jellybean ambayo sio official unaweza kubrick simu