The speakers attached to the device have been damaged, I bought another and first turned on the phone and the phone refused to recognize it and its connection sign does not appear at the top of the screen.

Hi there!

BV8000 Pro is equipped with a non-standard 3.5 jack port, so you'll have to buy headphones with a longer than normal head connector (or an adapter with the same feature).

Here you can buy Blackview original headphones:
https://www.aliexpress.com/item/New-Arr ... autifyAB=3

Refer to this threads for infos about an adapter:
viewtopic.php?f=191&t=168899
viewtopic.php?f=191&t=311088