Houston we have a problem.... any ideas how to fix; tried software refresh/roll back with assistant 2 mavic on Mac then pc both take forever then transmission fails, Fly app won’t do anything as it sees all up to date... be safe all!

Hi Bezerk, sorry for that case happened. You are recommended to send the drone in for a thorough diagnosis.
You may start an online repair request on our official web and then send it back. Here is the link: https://repair.dji.com/repair/index?site=brandsite&from=nav or contact our support team at this link: http://www.dji.com/support to open a case and then send it in.
Please be advised that due to COVID-19 prevention and traffic controls, product repairs and shipment times are expected to be delayed.