Two minor questions.
(1) It appears that usage of a Huawei EchoLife HG622 modem/router requires that the "HG622 workaround" option is selected. Why leave it to the EU to potentially miss selecting it? If "Huawei HG622" is the option selected in the "Modem/router model:" box then surely the "HG622 workaround" should be set automatically, thus dispensing with the "HG622 workaround" selection tick-box?
(2) Under the "Traffic Monitoring" tab, the options for the "Modem/router model:" box include two separate versions for a HG622, a HG612 (ADSL) and a HG612 (VDSL2) with no indication as to what the differences may be. As a consequence, with my HG622 I have selected "Custom" for the "Modem/router model:", selected "Other" for the interface and entered "0.0.38" into the "Other interface:" box.
1) If you select HG622 from the drop-down list on the login page, it should automatically enable the HG622 workaround option. I just checked again, and it does here.
2) I'm aware that the traffic monitoring setup isn't entirely satisfactory. The reason there are two HG622 options is that different users of that model reported different interfaces, and the interface which worked on my system didn't exist on someone else's. If you select one of those options, the values it applies are all copied into the other boxes on the setup page, so you can see what it does.
To be frank, I became totally frustrated by these and other inconsistencies, which is why the description of the feature is still marked as 'Experimental' on my website. It doesn't ultimately matter what model you select on that page, because you can always edit the values in the other boxes, and it's these which are actually saved and used. The limited drop-down list is simply intended as a convenience.