Quote:
Originally Posted by 730
Can custom software for 3 provide you with the same functionality they added on 4?
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No. Amazon reduced weight, made the bezel flush with the display and added water resistance. That's not something you can change with software.
Thus far, the PW3 is still receiving firmware updates so most features you get on the PW4, you also get on the PW3 (except for night mode, I think. I don't use it so never really explored jailbreak options for that).
As far as jailbreaking, there's no guarantee you'll be able to do a closed (software-only) jailbreak on either. Highest software jailbreakable firmware on PW3 is 5.9.6.1 and on PW4 is 5.10.0.2. Some brand new PW4s still ship with this but others already ship with 5.10.1.3 which hasn't been cracked yet.
If you're okay with physically operating on your Kindle, serial jailbreaking is always possible on the PW3.
I have yet to hear of a successful serial jailbreak performed on the PW4 (Android layout).