Perhaps @burakkucat could offer an opinion on this, having worked on various HG612 configuration issues.
It was so long ago . . . but way back, before asbokid released his first unlocked firmware image, Bald_Eagle1 had sent to "The Cattery" a HG612 from his collection of "spares". As someone had to perform the experiment, asbokid and Bald_Eagle1 jointly decided that the black cat should do the deed. The very first asbokid image was successfully flashed to the H612 and I had my first sight of the GUI . . .
Without changing any of the configuration, the HG612 was briefly connected to the incoming pair, which carried the ADSL2+ based TalkTalk service (LLU), and it failed to achieve synchronism with the exchange based MSAN. The status of the GUI menu Basic >> DSL Modulation type tick boxes was that just the last of the six, "ALL", was selected.
That first asbokid image was just about to be publicly announced when Openreach pushed out a new image. So the second asbokid image was quickly created by the maestro and passed to the black cat for testing. The flash of that image was successful and so it was the second private asbokid image was announced. To the public, that was the first unlocked image.
Following asbokid's announcement, the HG612 at The Cattery was reconfigured as a modem/router for an ADSL2+ based service and it was that configuration which was described on the
Huawei HG612 pages in the
Kitz Wiki. It was soon discovered that the HG612 was an underpowered device to act as a modem/router for a VDSL2 based service.