AB-COM IPBox 250S PVR User Manual - page 60
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3.
select a proper USB image for STB ( not serial image)
4.
pressing “Start”
*Note: You should check the version of bootloader. If it does not fit with application
software, you should download a new bootloader by using serial cable.
Downloading method of serial to serial ( Set to Set)
Master Unit
Connect two sets with Serial cable (Null modem cable)
1. Power on
2. Press the power button and the ""OK ""button at the same time.
3. Press and hold the power button and then the down direction arrow button consecutively.
4. The display of front panel will shows "5 2 5" shortly and then " 1"
and at the same time TV screen displays some firmware choices from 1 to 8.
5. You can select one of the items from 1 to 8 using left/right direction arrow buttons