A lot of errors coming after DJI mini 3 pro firmware update

[mahasingh]

My drone fell in water and after rescuing it and drying it completely, it had 2 issues
1. Battery charging couldn't be done in the drone. When connected to the charger the charging lights would blink normally but after 2 minutes, they just stop completely and the battery wouldn't be charged.
2. The signal connection between remote and drone started experiencing issues. The signal strength as shown on the remote would be perfect if the remote wasplaced next to the drone. However, as soon as the remote is taken 1-2 meters away, the signal strength would drop drastically and the remote would completely lose connection.
I thought of upgrading to the latest firmware thinking it might fix the issue.
I recently updated my DJI Mini 3 Pro firmware from v01.00.0700 to v01.00.0900 and after the update these many errors started coming (image attached). Now I can't downgrade to the previous version to check whether it was a firmware issue or something else. Is there any method to downgrade the firmware (I have tried with dronehacks as well but it shows that anti rollback value is 6, hence cannot downgrade)

 

[Felix le Chat]

You may find that most of the original issues were a legacy from the drone getting dunked in water. No matter how dry you think the drone is: there will usually be pockets of moisture within. Normally the only way to dry a drone out is to strip it down and clean all boards, components and contacts with iso alcohol.

Upgrading the firmware won't address issues like these, as you found out, the only outcome is to lock you into a new firmware where you haven't a chance of reversing the process.

Serious suggestion? First: contact DJI and tell them what's happened, it may result in a repair ticket being opened. If this isn't an option: try opening the drone up and deep cleaning all electronic components inside (isopropanol alcohol and a cotton Q-Tip). At this point you don't have anything left to lose.

 

[Starz]

As mentioned above, firmware updates are not a fix-all, more along the lines of what some would term as a placebo effect. Water and any electrical components are not a good mix. What you have now is not a trustworthy aircraft.
Sorry for your loss. Be safe!