Beats headphones (like the Solo 4) use Bluetooth Secure Simple Pairing (SSP), which means they should not be asking for a PIN at all. The PIN prompts you’re seeing are actually coming from your older device, not the Beats. Since the Solo 4 doesn’t have a "default PIN," the connection process fails because the device is trying to use the older Bluetooth standard (legacy pairing).
In short, your Beats Solo 4 are too new for the old pairing method. The headset is expecting a more modern secure pairing handshake, while your device insists on falling back to PIN-based authentication. That’s why the usual "0000 / 1234 / 1111" doesn’t work — the Solo 4 simply isn’t designed to accept it. If you want them to work together, you’ll either need to:
- Update the device’s Bluetooth stac (if it’s a computer, see if OS or driver updates are available).
- Use a newer Bluetooth adapter/dongle that supports SSP (Bluetooth 4.0 or newer).
- Use a wired connection with the Solo 4 (since they still support a 3.5mm input if wireless isn’t possible).