[Q] Framework.jar, zipalign? signed?

Hi everyone,

Firstly, if it's not the right forum, I'm sorry :)

I need a little help, I'm not sure if I need to zipalign et sign the framework.jar.
I modified it, and made an update.zip.

So, do I need to zipalign the framework.jar?
Do I need to sign it with my keystore? (the original one is not signed actually)
Do I need to sign the update.zip?
Do I need to zipalign the update.zip?

I suppose zipaligning is just needed for apk, but I'd like to be sure.

Thanks a lot in advance.