[Q] How to Port Android bbm.apk SDK10 to SDK8

[d3kilo]

I tried to decompile bbm.apk and change the androidmanifest.xml value for sdk8 and for androidversion 8 but still i can't use it after i compile it. So how to port apk SDK10 to SDK8? And what programs that i need to make it happen?

Since i'm still a newbie i think i need a step by step to port bbm.apk for froyo