Linksys EA8500

Overview
"EWW604-B1-L5 REV:205 (XC)" is silkscreened on the board in the photos.
 * CyberTAN EWW604 manuf.

"EWW604-B1-L5 REV:305 (XD)" is silkscreened on one newer revision unit.

Newer revision units omit a populated serial header and likely have newer firmware (which locks out flashing third-party firmware), necessitating flashing via manual TFTP in U-Boot (see here). According to the Product comparison chart of the EA7500, EA8500, E8350 and E8400
 * from Linksys, the E8500 supports wireless bridge and wireless repeater modes.

Reviews

 * Linksys EA8500 Max-Stream AC2600 MU-MIMO Smart Wi-Fi Router Reviewed - Part 1 on SmallNetBuilder

Forum threads

 * Linksys EA8500 on SmallNetBuilder forums