User GreyDoc seem be working with dd-wrt builds for Mediatek/Ralink.
Could well be that your AFoundry is a similar unit like any of
the well known brand units.
The picture you posted is not readable, the amazon site mentions MT7621+MT7612EN+MT7603.
I think the dd-wrt support for mediatek chipset routers is not as
wide than broadcom and atheros routers.
For the price of £69, I think there are better choices in broadcom and atheros side.
If it was me, using dd-wrt, would send it back.
PS. This thread could be moved to RaLink SoC _________________ EA6900 v3.0-r28139 std ░ WZR-HP-AG300H-DD-WRT v24-sp2 (01/04/15) std - build 25760 ░ WHR3-G54 v3.0-r29193 mini ░ WLI-TX4-G54HP ░ WBMR-HP-GNV2 ░ TL-MR3420v²