@PasKy Thank you, Indeed I have downloaded the three available version.

@PasKy In fact it's a German version (DE) used in another country where only ADSL2+ is available (no VDSL), I'm only using it in router mode not as a DSL modem.

@PasKy Unfortunately it's the latest firmware available. However, I am thinking about downgrading the firmware, is it possible ? Where can I find the previous firmware ? Anyway thanks @PasKy

@PasKy Thank you for your answer, but unfortunately it doesn't fix the problem, I tried deactivating the AbBloc, using different browsers, from the laptop, from the phone with no success

I kept changing the QoS priority of the Guest network on my Vr900v without success, it is always set to "high", I would like to change it to "low" but the setting is not saved. Is there any solution...