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1. Fix Express GSM configurator Not Working/Crashes/Errors/Unresponsive & Black/White screen:

1. Restart Express GSM configurator: Restarting the app will resolve most errors.
2. Update the Express GSM configurator App. Here is how:
   1. On Android goto PlayStore » Search for "Express GSM configurator" » Open Express GSM configurator » click "Update".
   2. On iPhone, goto AppStore » Your profile » Available Updates » Check for Express GSM configurator » click "UPDATE".
3. Clear Express GSM configurator app cache: Clearing cached data will force your app to retrieve the latest data directly from Express GSM configurator servers.
   1. On Android, goto Settings » Apps » Select "Express GSM configurator" » click Storage » click "Clear Cache".
4. Check Express GSM configurator app permissions. If any of these permissions required to use your device's features are disenabled, Express GSM configurator might not work.
5. Uninstall and reinstall Express GSM configurator. If nothing else has worked, completely uninstall Express GSM configurator then reinstall.
6. Restart your device. Last, restarting your device can often clear most problems causing Express GSM configurator not working

2. Fix Express GSM configurator Server issues & Internet Connection

1. Check network connection: An unstable Internet will make Express GSM configurator be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
2. Disable VPN: VPN can cause connection errors and lead to Express GSM configurator not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, Express GSM configurator may not be able to connect to the Internet when running in the background.