When you press the power button for 10 seconds, the battery gets disconnected, and the BRCK is set to the shipping mode.
In order to use the BRCK, you need to charge the BRCK for sometime. Once you connect the BRCK to the charger, the BRCK automatically resets itself and you will be able to turn it on again.
Regarding the 'offline' message, we have noted the issue with a couple of BRCKS and we are working to ensure that these BRCKs are in sync with the BRCK Cloud. Once you turn on the BRCK, kindly let me know if the information will be updated or not. I will be able to pick it up from there.