So allfreeloadersneed to either flash ipsw of dev 16.4 beta 2 or wait for public beta via settings app?
I suspect you are being tongue in cheek here. But for any who might try this, I doubt flashing the IPSW will work. I suspect that there is a signing / validation process being used. If you don’t have the right account type (a paid developer account) you will not be able to validate the software as part of the installation process. So it likely wouldn’t even install.
Time will tell