村村通接收机；芯片是M88VS2000+ES261344K+M88TS2020 单晶6芯面板，可以用SCOM软件进行备份，但是升级时连机失败，出现这样的提示语
Please reset the STB!
Got sync byte!
Start sending client...
Start to check serial...
Failed to get CMD response!
Failed to get CMD response!
Failed to get CMD response!
!!TEST CMD fail-1!
请问是怎么回事？
