From t-hack.com - Hack X300T / X301T
x300t: bootloader msgs
xosPc8 serial#e3eec781720b9f8258d2b8d9xxxxxxxx subid 0xc4
xenv cs2 ok
power supply: ok
dram0 ok (7)
dram1 ok (7)
zboot ok
SIGNED BL
Microsoft IPTV Bootloader, Build (1039)
Built by BM-DELL-167, Jul 13 2006 20:19:03
with 115k2 baud; SW1 == reset switch (usefull). 14pin J5 looks like JTAG.
JP4:
1 - n/c
2 - CD?
3 - DSR?
4 - CTS?
5 - RXD
6 - TXD
7 - RTS?
8 - DTR?
9 - Vcc +5V
10 - GND
JP5:
1 - TRST
2 - GND
3 - TDI
4 - GND
5 - TDO
6 - GND
7 - TMS
8 - GND
9 - TCK
10 - GND
11 - RESET
12 - n/c
13 - 10k pulldown
14 - 10k pullup - "target connected"?