How can I restart a bundle using OSGI 8 admin console without restarting OSGI server?

There is bundle Stop and Start button on OSGI 8 admin console as per below screen. I stopped a bundle, then I changed my code, then build new jar for that bundle and updated the jar to OSGI 8 server. Then started that bundle . New code not reflected. Any help. Plz.

Waiting eagerly for your response.