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Just like to share my experience.
I got a PW3 shipped from the US, to the US. Thereafter my friend brought it to me in Singapore. The device (G090 G105 8XXX) was pre-registed to my Amazon account with firmware 5.8.11.
1) Put in the file to prevent OTA updates before connecting to the internet to request for removal of special offers.
2) Did a reset of the Kindle (not connected to internet) and downgrade to 5.8.9.0.1.
3) Jailbroken with no issues, even did a reset.
4) Upgraded to 5.9.5.1, jailbreak remained. Attempted a reset (to fix the KUAL document not removing issue) and reapplied the hotfix with success.
It seems that may have been really lucky with the process but as usual YMMV.
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