Solved! Go to Solution.
There is still possible to access the menus.
You need to install Allinace Shild X from Play Store. Once you are registered and logged in:
Open the App Manager.
Look for com.samsung.android.app.telephonyui and click on it.
Scroll down to com.samsung.android.app.telephonyui.hiddennetworksettings.MainActivity.
Click on it and choose Open.
There is now everything you'll need.
NOTE: the app need Admin and Knox rights for this to work.
I hope it helps you guys to temporarily fix your issues.
Best regards from Germany
Hey bro, you can lock the apps so even If you delete the recent app it will still be there.
After setting Frequency, Click Recent and Lock Section for Frequency Setting by clicking Stay Open/Lock Apps.(In Bahasa Indonesia it is called Tetap Buka)
Saya harap ini dapat membantu anda🙌
@Sabir1: Are you able to clarify if the band selection app you're referring to is one that you've downloaded, or is part of the developer options? In the meantime, please head to Settings > Connections > Mobile Networks > Network Mode, and make sure that 5G/4G/3G/2G (auto connect) is enabled, as this will connect to the strongest available mobile data signal in your current location.
I have the same problem! After the June update of my S21. Even the network mode in the settings doesn't work. There no way to use all the bands.