A friend of mine had some Bitcoin on his phone a couple of years ago and he's lost that phone which stored the private keys on without any other backup. We can see his balance on the blockchain and he knows his password for the private keys. Is there a way of creating the private key from the bitcoin address and the known password?
No, sorry to hear it. Private keys is the one and only way to access your bitcoin. without it, your friend Bitcoin is lost forever.