I recently purchased a used ps vita for my son but when he tries to connect it to his ps3 system, it states that it can only be linked to the previous user. how do i change the ps vita to link to our ps3 ?
Welcome to the PlayStation Community.
Here are some links for you for future reference you may find of use, the first is the PS Vita Support Forum.
As for your question, you just need to perform a reset of the system, you should eb able to do this by holding down the power button.
Any issues come back to us here.
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