Great! I found out in a totally different section of the forum the following:
HOW DO I...?
Get stock ROM:
Make sure you have stock Recovery not TWRP.
Place your stock version on your SDCard in 'dload' folder, make sure it's named UPDATE.APP
Turn off your device
Press and hold Volume - and +
Press Power but still hold Volume - and +
It will now install stock, and also reboot.
I try this and I get message that the phone is secureboot phone.
This phone is LOCK State.