Apple today released the seventh beta of iOS 13 to developers, bringing new bug fixes and refining iOS 13 and iPadOS features introduced in previous betas. Now that we're up to the seventh beta, changes and tweaks are getting much more minor. You may install it on your phone and try it out.

Step 1 Connect your iDevice to PC with an original USB cable and launch 3uTools. 

Step 2 Go to Flash & JB → Easy Flash, select firmware iOS 13.0beta7. If you want to update with data, please check the box "Retain User's Data". There will be a pop reminder after you click "Flash", please read it with caution.

You are recommended to back up your iDevice regularly in case of data loss.

Step 3 Keep the stabilization of network and USB connection while flashing, wait patiently for around 5 to 10 minutes. Your iDevice will be updated to iOS 13 beta 7 after reboot.