ThinPro 5.0/5.1 is an important milestone. Any ThinPro images earlier than that version should be updated to ThinPro 5.0/5.1 first. So please upgrade to ThinPro 5.0/5.1 first, then upgrade to 5.2. Or after being upgraded to ThinPro 5.0/5.1, you can directly upgrade to ThinPro 6 - make sure the hardware is supported by ThinPro 6.
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