Just updated GO4. Works well with Mavic Air but my devise (Samsung Tab 2 8") will no longer connect to Mavic Pro.
With the previous version it worked very well with both drones. Is there any way to go back to the old version?

Look at it this way, you are only three updates to getting back to where you were.  
Next update, Mavic Air won't connect but Mavic Pro will.
Update after next, Neither will connect.
Update after that, Both will connect again.  
Well maybe.

Check dji assistant 2 . Maybe try to refresh the firmware .

Hi chopperphil, so sorry to hear about the issue that you are experiencing. For the firmware of the aircraft, remote controller and the DJI GO4 app, we do recommend the latest one. Please check and update the latest firmware for your Mavic pro and then try it again.  At the same time, to ensure the compatibility and the performance, it is recommended to use the mobile device on the compatible list of the Mavic pro: https://www.dji.com/mavic/info#downloads, thanks!

... even if the device is on this list, DJI can't guarantee that it will work...

Updates are often like this: fix one thing, break another...

you can have both dji go 4 app on your device, 4.1.22 for MP and 4.2.8 for MA.
First install 4.1.22 and then use apk cloner(change icon color and name) de-install it.
Install newest from playstore, then install the cloneapp version.
If you want more info PM me.

DJI Diana Posted at 2018-3-27 20:21
Hi chopperphil, so sorry to hear about the issue that you are experiencing. For the firmware of the aircraft, remote controller and the DJI GO4 app, we do recommend the latest one. Please check and update the latest firmware for your Mavic pro and then try it again.  At the same time, to ensure the compatibility and the performance, it is recommended to use the mobile device on the compatible list of the Mavic pro: https://www.dji.com/mavic/info#downloads, thanks!

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The version that I updated to is 4.2.8

You can downgrade your app for Android by downloading from apk mirror just search Go4

chopperphil Posted at 2018-3-28 03:42
The version that I updated to is 4.2.8

Hi, sorry for the inconvenience, when using the Mavic pro, have you tried to connect another interface? Please do not connect two interfaces at the same time. Thanks!