Duplicated posts...

No, it is a pure 5GHz band access point, it can only work in 5GHz channels.

You need TP-Link WA5210G to connect to 2.4Ghz AP's because TP-Link WA7510N is a 5Ghz access point.If you want to both 2.4Ghz and 5Ghz you should use Dual Band routers from TP-Link.

Yes you can also use CPE210 for 2.4Ghz.

But if Tp-Link want to make the WA7510N DualBand router they can
Because TP-Link WA7510N has Atheros AR9208 Dual Band Wi-Fi Chip, but the Tp-Link software has made it 5 GHz router if Tp-Link remove software limitations so it can be called a Dual Band router.

Another TP-Link router TL-WR841ND v5 uses the same chipset as WA7510N,like System on Chip is Atheros AR7240 and wireless chip Atheros AR9280 and this router is 2.4 GHz router.

I don't know why instead of unlocking all the firmware the tp link kept locking the firmwares.If they want,they can make it a Dual Band router just,but they didn't,firmware limitations.:mad: