This procedure looks like it's for MTK6577 phones running Ice Cream Sandwich. I just got an IPAI I7100 MTK6577 5.5" running 4.1.9 Jelly Bean and cannot root it with this ADB. The drivers work ok on XP and Win 7, but that's about it. I found one site that says the MTK6577 phones running Jelly Bean are not rootable, but I kinda find that hard to believe, If anyone can find the correct ADB download for Jelly Bean phones using this chipset, let me know. I'll respond if I find something too. Thanks.