ios - Submitting a new XCode project app as an existing app -

I have a published iOS app and no source code for that app.

Can I remake it from scratch as a new XCode project and publish it as an update to the original app?

Since the question was updated to my update, it is not okay, leave it anyway will be given.

The original question was:

My friend created and submitted an app but lost some of his source code I wanted to buy it from him and was wondering if I could make a new project, I could upload the app from scratch and upload binary as an update.

This was my answer:

You should do the following:

1. with distribution rights Create your own developer account
2. Allow the app to transfer it to your developer Account in iTunesConnect
3. Create an app code so that you can update it
4. Update the app
5. Whatever you want to do

Hope that helps :)