Ha ok i found out what i did if you download the files the wrong way then it will not work.
I downloaded all the files the right way then put it on my phone this morning on the way to my bus stop and it worked so i played with it on my way to school this is what you have to do.
When you download the "android.rootfs.tar" file it needs to look like a .rar image. ( One time i downloaded and had a blank icon or plain white)
The startup file sould be a text file but dont but "startup.txt" it sould just be "startup"
The Zimage and inird files sould not be anything. (Like one time it downloaded and said it was a .txt file)
I hope this works for the people who are having trouble.
EDIT: this sould help you
m15t1k0 thaats one of the codes i came up with