Samsung GT-I8190 on off problem - Samsung GALAXY S III mini

sounds like you have not set up your account on the device/ phone.

If it's in warranty take it to service center
if not, go to recovery mode and restore factory setting
if you are having the same problem in recovery mode, it might be a hardware prblm as well..
How to factory reset Samsung Galaxy S3 mini I8190

hard reset by recovery mode

have you ever tried to connect it manually?

If you mean the Samsung GT-i8190 then you may download the manual from http://www.samsung.com/uk/support/model/GT-I8190RWABTU-downloads

How To Install Whatsapp For Samsung Galaxy Pocket Gt S5300
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http://respondertechnology.com/how/how-to-install-whatsapp-for-samsung-galaxy-pocket-gt-s5300.html

call samsung toll free no
or go to samsung store/service centre
they'l upgrade it properly
sometime we are not good to handle it ie how to upgrade/restore

http://www.devicemanuals.eu/samsung-galaxy-s-iii-mini-gt-i8190-user-manual-free-download/784/