@Manas4938 From where did you get the v1.2.1(EU) FW ? You mentioned that you are with a US region FW. This firmware release (v1.2.1) cannot be degraded to the previous version. Follow this thread...

@york146 Consider this information on the support page: " Vx.0=Vx.6/Vx.8/Vx.9(eg:V1.0=V1.6/V1.8/V1.9) Vx.x0=Vx.x6/Vx.x8/Vx.x9 (eg:V1.20=V1.26/V1.28/V1.29) Vx.30=Vx.32/Vx.33 (eg:V3.30=V3.32/V3.33) "...

@Safara7 Archer C50 v6 simply doesn't support any VPN client or server. There's nothing you can do about configuring this feature on the C50. If you want to have this feature on your router, you...

@Manas4938 You can find the latest FW (1.1.28) here and update it manually.

@york146 You can determine the FW region by the router bottom sticker - details. If it happens to be an EU region, then you can download the first FW release (1.11.0) from here. But I think that this...

@york146 Apparently this is a matter of firmware release and there's nothing to be done in this case. Usually this has been resolved by setting a static LAN IP address and turning the DHCP off.