@fredou Hi Fred, the channel supported may varies due to its hardware/firmware version, as well as the country version of the product. You can tell me those information about your friend's product....

@CHR-VIE You can log into the web UI of the TL-WA860RE to get the current firmware version and hardware version. Then you can verify whether it is the latest one, if not, you can update the firmware....

@Wei_Hong0608 It seems that the local website does not upload the firmware. Below is the download link: https://www.tp-link.com/en/support/download/tl-wa855re/v4/#Firmware You can install it and take...

@Grizwold Thanks for your updates. Glad to hear that you figured it out by replacing the extender with the Deco M4. Now you can enjoy the mesh network with the Deco M4. If need more help in the...

@Cameron47 Do you mean Mac OS 10.15? And there is no driver for Mac 10.15 of Archer T2UH yet. Considering the ETA is unsure, you can search for a suitable driver online with its chipset. Which is...

@kojikb2 The chipset for TL-WN822N V5 is Realtek RTL8192EU.