Hi, my archer c20 v5 will not allow devices to connect to the 2.4 wifi , only one of them connects

 

 

Current config:

Archer c20 v5 

Firmware Archer C20(US)_V5_200915

Ap mode

 

Wifi config: BGN mode 20 mhz channel 1 o 11 (tried changing channel)

Security set to wpa/wpa2 automatic but tried setting to open network and the problem is there.

 

 

Everything else like mac filtering and wps is disabled

 

My devices

 

Xiaomi red mi 9 (not redmi note, redmi series, midrange)

 

Motorola moto g8 play. 

 

2 Mxqpro dual core android box.

 

1 Niatec dual core android box.

 

 

 

Tried:

Hard reset.

Firmware update

Change to router mode

Devices with ip address (I mean dhcp off and on, the problem is still there)

All of them has a different and unique mac address 

 

 

How only works and how Im using it now: 

Set to router mode. But

MY isp restricted ipv6 so in router mode only works ipv4. (In ap mode ipv6 works normally)

 

Setting wifi client isolation to on will let the devices connects but only when the archer.c20 v5 is in router mode. In ap mode will not let connect them, only one of them connects

The problem : 

Can't access to home shared network because wifi devices are isolated.

Functions like cast to the tv doesn't work with client isolation

 

How other devices works in ap mode:

 

Linksys wrt54g with original firmware works good.

Huawei  hg530 works good.

Linksys wrt54g with ddwrt works good.

All of them let connects my devices normally.

 

In my isp módem:

 

Can't set to bridge, isp has many restrictions.

 

 

Why needed Archer c20 : 

Because has strong wifi my house has 2 floors, is dual band.

 

Why not using the other routers like the linksys wrt54g: because don't have dual band , ipv6 natively is not supported and the wifi of those third party routers ar bg (54mb) .

 

 

What can I do?