Yes that's correct. Takes around 5 minutes to install 3.71 M33-1, same as an official Sony update.
Sorry to be a ball breaker x3, you've been very helpful and quick to respond.
When I'm on 3.71m33-1, do I leave the unmodule.prx file in the update directory when I flash to 3.71m33-2 or doesn't this matter either way?