DJI Mini 2 Not Connecting to Controller

Switch on the drone and the controller, and the smartphone.
Connect the smartphone to the controller.
On the DJI Fly app, go to “Connect to Aircraft.”
Tap on the Settings icon on the top right, then tap on Control
Scroll until you find Connect to Aircraft and tap on it.
The controller will start beeping with the 4 LEDs flashing.
Tap the drone’s power button and hold it for at least 4 seconds.
The drone will beep once, and the LEDs will flash in sequence, initiating the connection process.

If the process is successful, both the drone’s and RC’s LEDs will stop flashing, and you’ll see the drone’s live footage on the mobile device.

If you’ve not updated your firmware, this could be one of the reasons your drone is not powering up. Connect the drone to the DJI Fly app and the app should notify you that an update is needed. The app will guide you through the updating process.

If that doesn't work, the SD card can cause pairing issues. If you use very long names on your files, it may cause a pairing issue. Try changing the names of the Bluetooth device or your phone's name. Additionally, changing or adding files in the SD card will lead to problems. To fix altered files, you need to return the files back to their original state or replace the SD card with a new one. To replace the SD card take the current one out of the port on the back of the drone and put the new one in there.

Currently, the DJI FLY APP is only compatible with the following phones: