I am planning to sell my mini3 pro, but I notice there are tons of flight log on the drone which I have no way to erase.
Since I always took off from the backyard of my house I am concern that people could easily keep track of where I lived.
Is there any way I could erase the flight logs from my drone before i sell it off?

Hello there. Good day and thank you for reaching out. Just a friendly reminder that the new owner of the DJI Mini 3 Pro can't get into your DJI account unless you give him your login information, or sell the DJI drone with your device included & still logged into your DJI account. In addition, once the new owner of the DJI Mini 3 Pro creates a new DJI account he will be starting a new account and all of the past records will not be included on that account and a new record will start. Thank you.

I am concern that people could easily keep track of where I lived.
Don't worry.
There's nothing on the drone that anyone can read for themselves to tell where you've flown.
Those files are on your phone or tablet.

However, I am able to use DJI assistant to read all the  flight record on the drone now...

The onboard flight records are encrypted so they should be reasonably secure.  You can see that records exist with Assistant 2, but you can't actually view them.

fans2cfccf3c Posted at 9-10 01:27
However, I am able to use DJI assistant to read all the  flight record on the drone now...

Not much you can do with them unless you have the decryption key.  

Just a reminder to remove the Mini 3 from your DJI account before selling it. The new owner won't be able to register/fly it unless it is removed from YOUR account.

you can delete it from your phone

Having the same question. With DJI Assistant I can see all the logs, even after factory reset. I also see the logs from the factory (test flights as it seems). How to delete?

Drohnenfieber Posted at 9-10 06:27
Having the same question. With DJI Assistant I can see all the logs, even after factory reset. I also see the logs from the factory (test flights as it seems). How to delete?

Don't worry about them.
You can see that they are there, but you cannot open them or read them.

Drohnenfieber Posted at 9-10 06:27
Having the same question. With DJI Assistant I can see all the logs, even after factory reset. I also see the logs from the factory (test flights as it seems). How to delete?

As Labroides said, the logs are there but they are encrypted & can't be viewed without the cipher.  The internal flight logs are like the black box on an aircraft.  If people could simply delete the logs at will it would defeat the purpose.