The ONU firmware update result.
updating - The ONU is updating firmware right now.
ok - The ONU update result is OK.
fail - The ONU update result is fail.
fileNotExist - The ONU update failed because the file does not exist.
notSetFilename - The ONU firmware filename is not set.
fileNotMatchONU - The ONU firmware does not match the ONU.
timeout - The ONU responses timeout.
otherError - The ONU update result is unknown.