PW2 Updating Kindle with Jailbreak

Hi, I'm sorry if this question has been asked before. I tried the search but nothing came up that could help me.

I have a PW2 on 5.4.3.2

I have KUAL and Koreader installed, but reading through all the threads I can not make sense out of it. Can I update my Kindle without losing the jailbreak?

If so, how?
And up to which system version?

Thank you