PW4 normal firmware: Not jailbreakable as-is.
PW4 fw <= 5.10.1.3: Can install factory firmware and use ;installHtml (or ;merchant) jailbreak method.
PW4 fw > 5.10.1.3: No known vulnerabilities at this time in both normal and factory firmware (Amazon already fixed the one we use for ;installHtml and ;merchant). No idea if/when a new jailbreak method will be discovered.
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