Polk Solo don't work Bluetooth

Pacific

Hello. I have a Polk Solo soundbar connected to the Xiaomi Mi box 3s. At first I was very annoyed that the soundbar, if I had not used it for some time, turned off. To turn off the automatic shutdown mode (found on some forum), I simultaneously pressed the Power button and the Volume Up button 10 sec. The soundbar stopped going into sleep mode, but Bluetooth stopped working too. Nowhere can I find any information on how to turn it on. Everything works fine through the optical cable, Bluetooth not work.