About 2 months ago, I brought a TP-Link router from Saudi Arabia. Although the router supports 5 GHz, my Nothing Phone (1) and Galaxy Note20 Ultra do not support 5 GHz. Both phones were purchased from Saudi Arabia before I bought the router. However, my mother's phone was purchased from Bangladesh and my mother's phone was connecting without any problem on 5 GHz. Later I found out that the channel varies from region to region and my router was purchased from Saudi Arabia. Where in Bangladesh I can find out that 5 GHz works on channels 149-160. Later, after restarting the two phones I was using, I saw that 5 GHz was working on both my phones. But, as soon as I turn off the airplane mode and turn on the SIM connection or mobile data, the 5 GHz connection is getting disconnected. Does AX55 have any firmware for Bangladesh? Through which the router will be able to get 149-160 channels. Because, now I am getting 36-127 due to the firmware of the Saudi Arabia region.