Main brush issue and can’t submit for a repair

I purchased my model in July 2025. It cleaned my bedrooms twice a week. The dreame L10s pro ultra heat worked really well until the main brush jammed - it happened just half a year after purchase. At first I thought it was a very easy fix - after all, we’ve all been through main brush jam. However, this time it’s different. I’ve done all diagnosis and try to fix following all tips from ChatGPT. I also bought a brand new main brush to replace the old one. I still got the error message.Anyone ran into the same issue?