Had a
mavic 2 Pro firmware mismatch. After probably close to 6 hours or more of wasted time ,a call to dji, and ordering a new PC(which I was already planning to buy a new puter but not a huge priority) to try assistant 2 with when it arrives.I decided to call DJI one more time because sometimes it depends who you talk to. so this guy says make sure you take out the sd card. Sure enough as soon as I did that it downloaded the firmware without issue. Ho after searching threads etc did it not come to my attention that the sd card must be removed wow.
They had offered to let me send it in but that was going to be my my last resort. It seems odd that the controller updates without assistant 2 but the drone must be connected to a PC.
not the issue you were having but it will help someone so I'll say it loud and clear ****
TAKE OUT SD CARD WHEN DOING FIRMWARE UPDATE USING DJI ASSISTANT 2