Stack Exchange network consists of 178 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
In the case you set a bounty for your question and gave it to someone but after trying the accepted answer it did not work: how could you take back the bounty and let the question open again for a useful answer ?
That is not possible: All bounties are paid for up front and non-refundable under any circumstances.