I don't know why you are not able to fly, can you post screen shots or a video of attempting to unlock a zone.
You can also unlock zones from your computer.You said you are trying to ditch 2.6+ and go back to 2.6. That means you ARE NOT on 2.4.4 GEO Beta app.
Here's some instructions I typed up last week.
Instructions for GEO Beta app download onto Android device (currently only available for Android) IOS on request
Uninstall the GO app from device: Go to settings, Applications, Application manager, find GO app and uninstall. Click on Android Beta Version APK, Agree to terms and it will then download Go to My Files, in Recent files click on the DJI app icon and it may say “Install Blocked” click on settings (if you get a different error then go to settings and scroll down to “Lock Screen and Security” Under Unknown sources slide the button to ON. Then go back to the DJI icon in My Files and then tap the icon and click agree and then the new 2.4.4 GEO Beta version app will open.
You also have to install the 1.7 firmware for your aircraft from the same DJI link. (only available for the P3 Pro/Advanced and Inspire. When you get to the flying site, if it’s an Authorization Zone you can unlock providing a credit card or mobile phone number (using cell will send you a text message with a code)
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