Nothing to add to rks post, except that if you still have problems after replacing the fuseholders, check the connectors. On the YY250T, the brake lamps (not the running lights) are in fact DC powered, and it wouldn't surprise me if the Roketa bikes are wired the same way, so you need to track down the DC supply problem before replacing tail lights.
Pretty much every thing you've stated isn't working, is due to DC not reaching the front instrument cluster.
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