Have got answered on this, I need same solution , please help me as well.
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Hi! TC55 downgrade KK -> JB is not supported, as far as I know. Bad luck!
it's only possible via Zebra Tech center and only if the TC55 has JB installed from factory (afaik)
you can do it, i have tried it and it works normally.
try to download the the below from zebra to downgrade from KK to JB
run it on your TC55 respectively.