Tom and welcome to the
Kitz forum.
Let's assume that when your
Huawei HG612 arrives it has not been flashed with any unlocked firmware image. Therefore, depending upon its prior usage, it will either be using the
Beattie firmware from before October 2013 or the latest version, remotely pushed around October 2013.
This
forum post by
Wolfy introduces the unlocked version of the latest
Beattie firmware. Currently there are three variations of the latest unlocked firmware image -- unlocked, unlocked & with the GUI restored and unlocked, with the GUI restored & BTagent removed. (The latter two firmware images are in the
Experimental directory.)
For now, I would recommend that you use the second out of those three images --
bcm96368MVWG_fs_kernel_HG612V100R001C01B030SP06_unlockedgui from the
Experimental directory.