Ensure your earphones are fully charged and paired with your smartphone.
I should start by defining what firmware is. Firmware is the low-level software that controls a device's hardware. Updating it can fix bugs, improve performance, enhance security, add features, etc. That's a standard explanation, so including that makes sense. d01g firmware updated
Because this is an older device (originally released in 2015), official feature updates (like jumping to a new Android version) are rare. However, the enthusiast community often uses specialized tools to: Convert to Global Firmware Ensure your earphones are fully charged and paired