Probably a stupid question....... I know there are 3 Beta Versions released already. Do you have to install them in order from Beta 1, Beta 2 and Beta 3? Or can you just go straight to Beta 3 from Android 7.1.1, currently on Build NMJ88C.
You can go directly to Beta 3.
I have an unlocked bootloader.
I load the ROMs via fastboot.
You can go over to the XDA forums and look in the ROM section.