Hey I'm new in this forum.

I'm currently using an iPhone 3GS with a jail broken ios4.1

I can't use any of my apps such as whatsapp and others due to the restrictions which require ios4.3.

Therefore, is there any way for me to upgrade to 4.3 (prefably jail broken)?

And if I do update my iOS, will I lose all my whatsapp chat logs and messages, contacts etc?

Hopefully someone can help me out. Thanks!