[jljtgr]

A lot of flashing commands in Android seem to reserve 50% for transferring and 50% for installing. So 47% probably means it transferred the file, but did not get into installing it because of the signature failure. At face value meaning the device did not think the ZIP was signed with a private key that it had a certificate for. APKs are signed like this too, I guess.

EDIT: I got around to updating my phone today and observed that the phone starts the install process at exactly 47% as well. So this number seems like the normal file transfer endpoint.