PW2 Is it worth to upgrade from firmware 5.6.5 to the newer 5.8.9.2?

Hello. I have a kindle PW2 Japanese edition (4gb), I remembered I jailbreak it a couple of years ago. Since then, I didn't used it much so I am kind of unaware about the improvements the device might received in this frame of time.

This is what I installed before on firmware 5.6.5:

==
JailBreak-1.14.N-FW-5.x-hotfix.zip
KUAL-v2.6.zip
kual-mrinstaller-1.6.N.zip
CollectionsManager_2.8.1.zip
koreader-kindle-arm-linux-gnueabi-v2015.11-stable.zip
==
***I also attached a picture of the root folder of the kindle***

So the questions I have are:

1. Is it worth to upgrade to the newer firmware available? Am I missing any new feature? or any critical update? maybe better battery with the new software?

2. If I update, can I still block the pesky auto-updates Amazon push without the user consent? I think I created before some kind of file in the root folder of the kindle that blocked the updates successfully

3. If I update, should I reset the device?

4. The jailbreak will survive in the new firmware?

5. If you were me, will you update it or leave it as it is?

Thank you if you read this, and any orientation will be much appreciated! :thumbsup:

Attached Thumbnails