Hey there! @Omair_Misbah, Thank you for reaching out for assistance with your v2 Hub.
I would first attempt force closing your app and attempting to add your specific hub by model code: STH-ETH-2
A solid blue LED means the Hub is attempting to connect to the SmartThings cloud/servers. if the light remains solid blue for longer than 5 minutes, this indicates the Hub is unable to establish a connection with our servers.
Unplug the power cable and remove the Hub’s batteries for 30 seconds, then plug the cable back in and replace the batteries. Wait until the Hub LED is solid green and try connecting again. Attempt to reboot your router to see if the symptoms persist.
You can then attempt a factory reset of the device using the steps below:
Disconnect the power cable and remove batteries from the Hub
Using a pin or similar tool, hold the reset button on the back of the Hub
While continuing to hold the reset button, replace the power cable
Continue holding the button for more than 30 seconds
When the LED switches from flashing yellow to solid yellow, release the reset button
Reinstall batteries into the Hub
Note: If you do not release the button within a few seconds after the LED switches to solid yellow, the Hub may not begin the reset.
If the symptom persists, I would recommend creating a Support ticket so we can look into your concerns further.
You can reach out directly to a support team in your area using the below information:
I hope this message finds you well!