how to flash using SD card:
1) prepare a card - format the card using the BootcardMaker program
2) drop 2 files onto the card - aml_sdc_burn.ini and aml_upgrade_package.img
3) turn off the set-top box and unplug the power cord. Leave the HDMI cable plugged into the set-top box and TV.
4) insert the card
5) press the “reset” button through the “AV” audio port and hold...
5) insert the power cord (while holding down the "reset" button)
6) wait until the progress bar appears with the inscription "Upgrading..."
7) release the "reset" button
8) ready