If you usually do Clear cache only on the browser, you can also do it in Mobile Apps. You can clear the cache to reset previously configured settings or the username / password saved to the device. Clearing the cache might occasionally assist us in resolving minor issues that usually can happen. You can check the following steps to follow :
Step 1. Open Setting Menu on Tablet
Pick Apps, then select DealPOS.
Step 2. Choose Force Stop, then Open Storage
Step 3. Clear Cache & Clear Data, then Relaunch Apps
You might also read this article :
If you're having trouble logging into mobile apps, take a look at this article : Authentication Error After Sign In
If you'd like to try out the DealPOS mobile apps in beta version, follow the instructions outlined in this article : Installing Beta version From Play Store
You also can check how to set up the printer using Bluetooth / IP Network