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Here are the methods to reset each speaker:

Front Surround Speakers

Method 1: Press and hold the Power button for 8 seconds.

Method 2: Insert a pin into the Reset hole, then press and hold for 10 seconds.

Rear Surround Speakers

Method 1: Press and hold the Power button for 8 seconds.

Method 2: Insert a pin into the Reset hole, then press and hold for 10 seconds.

After reset:

Go to Settings → Remote & Accessories → Pair More Official Accessories.

Follow the on-screen instructions to re-pair your speakers.

If you have any other questions, please don't hesitate to contact Nebula Customer Support at service@soundcore.com  for further assistance.