@TP-Link There is no major problem because I can select "Annex A" or "Annex A/L" or "Annex M". But "Annex A/L/M" mode would be good to set Annex M automatically when it is available. It is just a bug...

@TP-Link They don't accept because the modem is working fine. It just doesn't set in "Annex A/L/M" mode.

@TP-Link Yes, default mode without any internet configuration. It's about 2 months.

@TP-Link Yes, the problem still exists:

@TP-Link Unfortunately, the newer firmware didn't fix it too: "1.2.0 0.9.1 v00a1.0 Build 210220 Rel.36504n"

@TP-Link Yes, it happens only when I modify the DSL settings. It doesn't accept "Annex A/L/M" at all. The default setting is "Annex A/L" but I would like to set "Annex A/L/M" to enable Annex M when...