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Don't know for sure, but I think it has. And that's perhgaps the reason the 1.3x blocked downgrading. Otherwise they had to fix all firmware versions.But rest assured, the HNAP issue isn't that serious, it is only an inside-LAN-issue, it does not offer access from outside your LAN nor are there any expoits that use this bug. My general rule is that even without HNAP anyone that has LAN access is already an security issue