Ishtiaqa wrote

i want to know is there any setting to change country because US has more transmit power i hope it will solve my problem 

No, this is not possible. What's more, it won't help at all if walls reflect EM waves. Increasing transmit power in a faraday cage would only increase interferences in the room the EAP is mounted. Of what material are the walls exactly? Reinforced ferroconcrete?

@Ishtiaqa, that's a sign of too much interferences inside the room already with the current TX power.

You wrote you deployed 75 EAPs. What's the distance from one EAP to the next ones?

How many rooms?

What dimensions of the whole area (length and width in meters)?

What material are the walls made of exactly? Reinforced ferroconcrete?

What's the thickness of the walls? 12.5cm? 6cm? Or an exact multiple of this?

@Ishtiaqa, no change with reinforced concrete. The rooms are faraday cages. I would have recommended to use EAP225-Wall or EAP230-Wall, one in each room, low TX power.

Alternatively, a WBS210 with sector antenna could work if the rooms have big enough windows without coated glass (I deployed such a system for rooms completely made of metal). But in this case you would need to make measurements first using a WiFi heat mapper to find out whether this could work reliably.