Linksys WRT54GR v1.0

WRT54GR v1.0 serial numbers appear to start with MK9.

Specs
Platform Serial Num. = ? FCC ID = Q87-WRT54GR Industry Canada ID = 3839A-WRT54GR CPU Type = RDC R3211-G MIPS Rev = ? CPU Speed = ? Bus = ? Flash Type = ? Flash Chip = Eon EN29LV320T-70TCP Flash Size = 4 MB Max Firmware Size = ? RAM Size = 16 MB RAM Chip = GLT GLT51280L16-6TC nvram Size = ? ETH chip1 = RDC R3211-G Switch = IC+ IP175C Port-based vlan = ? 802.1q vlan = ? Ethernet Port Count = 1-10/100-WAN 4-10/100-LAN Wired Standard = IEEE 802.3/3u Ethernet interface OUI = 00:14:BF boot_wait = ? bootloader = RedBoot Flash Card Socket/Type = No SD/MMC Mod Support = No Expansion IF types = 1x Mini PCI PoE = No Power = 12 VDC, 0.5 A Connector type/size = ? LEDs/Color = Eth 1-2-3-4, DMZ, Internet, Wireless, Power Size = 5.51" x 5.12" x 6.69", (W x H x D) (140 mm x 130 mm x 170 mm) USB = No Serial Port = ? JTAG Port = ? Supported by TJTAG/Version = ? Special Features = ? Radio WI1 module = Gemtek WMIR-180GH WI1 module IF = Mini PCI Wireless Radio = Ralink RT2661 WLAN DSP processor = Ralink RT2529 Wireless interface OUI = 00:14:BF Antenna Connector Type = none MIMO status = 1x2:1 Wireless Standard = IEEE 802.11b/g 802.11g = 6, 9, 12, 18, 24, 36, 48, 54 Mbps  802.11b = 1, 2, 5.5, 11 Mbps WiFi Operating Frequency = 2.4 GHz Radio cor_rev = ? Radio Capabilities = ? Other Default IP address = 192.168.1.1 Default login user = blank Default login password = admin Default SSID = linksys OEM = Gemtek WRTR-136C (WRTR-136C_V02) 3rd Party Firmware Support = ?

Links of Interest

 * On the OpenWrt forums

Serial Pinouts
rxd - o   o - - o   o - - o   o - txd - o   o - gnd - o