Soundcore Liberty 3 Pro doesn't appear on Bluetooth list

I bought them today, connected them to my phone and everything was ok. After 6 or 7 hours i tried to connect them again, but they didin’t connect to my phone. I forgot them in my Bluetooth list and tried to connect them again. Didn’t help. Then I tried to reset them, by holding button on the case for 3/10 seconds. Didn’t help. I tried to follow tips on this thread: Liberty 3 Pro - Not showing up on Bluethooth lists. Didn’t help. I cant turn them back using my warranty, because i bought them not from a store, but from my friend, who never had issues with them. Sound was good, transparency/ANC modes were working perfectly. Please help me.