Does anyone know how to fix this error after a bad battery firmware update? The Agras T40 drone does not recognize the battery when it is turned on. Is there any protocol that works to resolve MAUOD/ANw4D21JZGH/AAAAAElFTkSuQmCC[/img]

Hi there, sorry for the issue you encountered. May I know if the battery issue is the same as the screenshot you provided on the 2#? If all 4 LEDs blink at the same time fastly, you may need to send the battery back if it is within the warranty period.
You can start an online repair case here https://www.dji.com/support/repair
Please let me know if it is a different issue. Thank you.