TP-LINK TL-MR3420 v2


 * WLAN: 802.11bgn 2T2R 2.4GHz (300Mbps)
 * Antenna: 2x 5dBi external (RP-SMA)
 * Ports: 1x WAN FE, 4x LAN FE, 1x USB 2.0
 * Compatible with UMTS/HSPA/EVDO USB Modem

The Flash appears to be a Spansion S25FL032PIF (4MB)

Possible 64:70:02 (TP-LINK) OUI (in the FCC photos)

Hardware Info Model:		MR3420			MR3420 Version:	1/1.1/1.2		2.3 Manufacturer:	Atheros 		Atheros Bootloader:	U-Boot			U-Boot Architecture:	MIPS 24Kc		MIPS 74Kc System-On-Chip:	Atheros AR7241@400MHz	Atheros AR9341@535MHz Flash chip:	Macronix MX25L3206E/	Winbond W25Q32BV/ cFeon F32-100HIP	Spansion FL032PIF Flash size:	4 MiB 			4 MiB RAM chip:	Zentel A3S56D40FTP-G5	Winbond W9425G6JH-5 RAM size:	32 MiB	 		32 MiB Wireless:	Atheros AR9287 (2T2R)	Atheros AR9341 (2T2R) Antenae(s):	2 Removables x 3dBi	2 Removables x 3dBi Ethernet:	4x LAN, 1x WAN 10/100	4x LAN, 1x WAN 10/100 USB:		1 x 2.0 		1 x 2.0
 * TP-LINK TL-MR3420 on OpenWrt wiki