Más bien será del cable que del Windows. O del adaptador. Yo tengo Windows 10 y recupero los skybox sin problemas con un adaptador usb serial. 
yo  tanto  con  xp  como  con  windows 10  me  da  los  mismos  errores  me  tiene  desesperado  y  probe  tambien  tres  cables  diferentes
Please reset the STB!
BOOTROM ...
Start Calibration ...
CLOCK_OFFSET = -17 
DELAY_90_OFFSET = 0 
DELAY_9090_OFFSET = 0 
DQS_IN_90_OFFSET = 0 
0:range 2 start = 0  end = 0 rl_add_i = 4
0:range 2 start = 0  end = 1 rl_add_i = 4
0:range 2 start = 0  end = 2 rl_add_i = 4
0:range 2 start = 0  end = 3 rl_add_i = 4
0:range 2 start = 10  end = 10 rl_add_i = 4
0:range 2 start = 10  end = 11 rl_add_i = 4
0:range 2 start = 10  end = 12 rl_add_i = 4
0:range 2 start = 10  end = 13 rl_add_i = 4
0:range 2 start = 10  end = 14 rl_add_i = 4
0:range 2 start = 10  end = 15 rl_add_i = 4
0:range 2 start = 10  end = 16 rl_add_i = 4
0:range 2 start = 10  end = 17 rl_add_i = 4
0:range 2 start = 10  end = 18 rl_add_i = 4
0:range 2 start = 10  end = 19 rl_add_i = 4
0:range 2 start = 10  end = 20 rl_add_i = 4
0:range 2 start = 10  end = 21 rl_add_i = 4
0:range 2 start = 10  end = 22 rl_add_i = 4
0:range 2 start = 10  end = 23 rl_add_i = 4
0:range 2 start = 10  end = 24 rl_add_i = 4
0:range 2 start = 10  end = 25 rl_add_i = 4
0:range 2 start = 10  end = 26 rl_add_i = 4
0:range 2 start = 10  end = 27 rl_add_i = 4
0:range 2 start = 10  end = 28 rl_add_i = 4
0:range 2 start = 10  end = 29 rl_add_i = 4
0:range 2 start = 10  end = 30 rl_add_i = 4
0:range 2 start = 10  end = 31 rl_add_i = 4
0:range 2 start = 10  end = 32 rl_add_i = 4
0:range 2 start = 10  end = 33 rl_add_i = 4
rang0: 00 0 0 , rang1: 00 0 0 , rang2: 24 1 0, rang3: 00 0 0 
DDR2 Calibiration param is: clk star 10, end 33, rdclk_rising_latch 1, digclk_neglatch 0, rd_add 4 
0xa4 = 33339000
0x38 = 72140001
0x50 = 00150910
0x4c = 00080001
0x44 = 001b0000
0x54 = 08080808
Calibration done, cost 11 s
DDR Calibration SUCCESS
Got sync byte!
Start sending client...
Start to check serial...
Prepare to download...
Start downloading data...
TRANSFER: RSP ERROR code:0
TRANSFER: RSP ERROR code:0
TRANSFER: RSP ERROR code:0