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.
Before you try downgrading the device FW - could you please elaborate a bit more what sort of wifi issues are you having?
Going backwards most likely wont do you any good at all.