@TP-Link_Deco 

Thanks for confirmation, but problem is i tried all of those Firmware version but They don't work 5ghz perfectly but when i use below version my 5ghz working fine

" M5 1.0_en_1.4.5 Build 20200721 Rel. 64257_US_up_beta.bin ".

We have 6 mobile and 2 laptop. Only one laptop can connect with 5 ghz and another every device connected with 2.4 ghz. What i do now? I will change the version for i will wait for new update?

@Tariq83 

Hello, thanks for the verification.

What is the region version of your Deco M5, is it US or EU?

Currently, the Deco M5 5GHz only works on band 1 and it doesn't support band 4 channels, while we assume your phones and laptop may require a 5GHz band 4 signal.

Thanks.

@TP-Link_Deco 

No Sir, your information is wrong. When i use beta version i got 44 channel also in my M5 router under 5 ghz but Yesterday when i update to your recommended version, now i can't connect with 5 ghz. My all device now connected with 2.4 ghz. Its really funny.

Last 6 month i used this deco M5 and only beta version can give me 5 ghz support but not other version. I will stay beta version but problem is i faced some issue under beta version. So that i want to move to stable version and i done already it. My other issue is solved but 2.4 ghz and 5 ghz problem now raise again.

Its really ridiculous from TP Link . Before i used Netgear, Dlink router. If i get any issue and i can complain to there support tem. They solve this issue within 4 monht, if its major issue.