it can't support airplay while TL-WA850RE V1.20 does~

after you set RE successfully, you can only detect main router SSID because there is no own SSID on TL-WA850RE. in order to test whether TL-WA850RE is working or not, just connect TL-WA850RE to your...

yes, the default mode is access point ~

never heard that so far~

If you connect PC to TL-WR940N by a cable, can you access internet? if wired connection is working, set a fixed channel on router. do you use TP-LINK utility? just install TP-LINK driver and use...

Seems that you have tried many methods~ that's very annoying.... perhaps you may try to change a different wireless channel on your router.