You're talking about ages ago, right?  Because DJI fixed the bad update ages ago.  AFAIK, there is no way to fix the bricked device.  You need to replace it.  You can find them used on eBay.  They are not expensive these days.  Good luck

You're talking about ages ago, right?  Because DJI fixed the bad update ages ago.  AFAIK, there is no way to fix the bricked device.  You need to replace it.  You can find them used on eBay.  They are not expensive these days.  Good luck