What if the lock says "operation failed" but doesn't indicate the reason why?

Question

What if the lock says "operation failed" but doesn't indicate the reason why?

Answer 

If the lock says "operation failed" after an existing code is entered or another electronic means is used, we recommend the following options.

• Restart the smartphone 
• Run the "Data upload" function in the lock's "settings" menu.
• If necessary, reinstall the App.
• Contact cs@sifely.com