The amber flash after the green flash means that the antenna was never paired to the EVO-ONE correctly.
Page 6 of this instalation guide has the proper pairing method. https://fortin.ca/download/69731/evo-start-2-install-guide-69731.pdf
-- ignition ON-OFF-ON
-- Press and Release the Brakes 4 times
-- Antenna will start to flash rapidly blue
-- Press and Hold antenna button until the LED turns Green. Release as soon as it turns green
-- Turn Ignition Off
make sure to press unlock on the oem remote to ensure that the evo-one is disarmed before attempting to pair the evo-start.