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Red 250ms Green 250ms alternates, flashing before power off.
Main program upgrade Failed:
Red 1750ms Green 250ms alternates，flashing before power off.
Notes: In the upgrade process, as timer software is used to control flashing, situations such
as LED light stuck when creating partition of flash, is normal phenomenon.
B、Power On Upgrading
STEP 1：Copy the Upgrading File (SW) to a USB disk .
STEP 2：Link USB disk to board, out AC then put on AC, the update begin and led start to
flash. The upgrade result can be seen from led's flashing speed.
STEP 3：Plug USB disk and AC out, then put on AC, upgrade finish.
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