All I can say is that I have two PW4 (10 generation). I jailbroke both of them following the instructions (5.16.8 and 5.17.1.0.3) and both them are now jailbroken. Since I had two of them, I updated 1 to 5.18.1, reinstalled the latest hotfix/KUAL/MRPI and the jailbreak had survived.
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