What do you mean "produce deiscarded"?
Are you talking about rejected shares? Or are you talking about flashing it to stock firmware but rejected?

If you talking about rejected shares can you share your miner's logs here so that we can analyze the issue?

The reason might be overheating which causes a high rejection rate.
Sometimes high rejected shares is due to high ping or due to other hardware issue.

You can try to reduce the power limit on the Braiins dashboard then update here it fix your issue.