i can't move the rigg for one of my models

hi everyone.
i have a model of a character and while i was testing the the rigg all the bones locked and won’t unlock. the only bones that work are those connected to the IK bone but nothing will rotate. what’s happened?

Did yo turn on Auto IK? Or is the IK chain length too long? Just asking.

well they were all working then i whent to ajust my characters thumb and it all went wierd. the character is a duplicate of another one and i’ve never had this type of problem before. i can still use the grab tool but just not rotate and i don’t know about scale. is lock rotation ment to be ticked? i started unticking that on all the bonse but nothing worked.