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He shouldn't do anything to recover his RC and than undelegate.

looks like his rc never recovers enough with that new system. he can't even comment "I want to undeleg.ate"

tipu has rules, go look at it...its been a long time for me but I think you should send 0.001 to tipu with memo "undelegate" o something like that...read the rules before doing anything...

I believe in a few days he should get back his sp

You can use steemdesk to undelegate without having to do use the rcs that a comment costs.