Sadly I don't remember the exact firmware version I had but it was listed on the not supported ones on the wiki. I tried my luck and downgraded to 5.7.4. Took a while. Had to manually reboot after a while but it worked fine. I've then been able to JB with no trouble.
On the wiki it's written "I've downgraded my PW3 from 5.8.11 to 5.7.4 without any problem."...
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