This got me to finally put effort into upgrading the firmware on my brother printer, which was still running stock firmware. There was only a password-entry, and that didn't let me access anything. After running Brothers updater in a VM, and sharing the usb-device, I managed to upgrade the printer. However, still no login, and now I need to get it reconnected to my wifi, ugh.

Try entering a long wifi-password via the 1-line lcd and 2 buttons on the printer, what a nightmare. (No way to configure via usb). Oh well, I still have a couple of days before I need to print a bunch of documents, so there goes the weekend ;)