How do I do a hard reset.
I should mention that the problem started after a crash which tore off a motor. I replaced the motor and after soldering repairs and going through the startup process I realized the camera sensor message.
Did you check the camera connectors?
They can also be slightly detached during utro.
I found this info ...
1. Delete Tello's app and reinstall it. 2. Forget Tello's wifi on your mobile.
3. Reset its WIFI: Turn the TELLO on until its flashing yellow rapidly, then press and hold the power button for 5-8s until the led goes off, then reconnect after it auto rebooting.
If the error appeared after crash, there are many reasons possible.
Try to reset and check camera's connector.
Do you know about wifi antennas placed under motors ? You can damaged one when replaced motor.