Don't worry about coming to the branch to update your passbook, now get your passbook on your smart phone.
Unlike mobile banking, you need not fill any application form- just download the application and start using it. You will need to generate an MPIN.
You may need to activate a data connection on your phone to receive this service.
With CSB, it's support all the way.
To download, click this link https://play.google.com/store/apps/details?id=com.lcode.csbepassbook(Only android)