Go to Settings->About phone, and continuously tap the ""Build number"" 7
times. Go back to Settings->System->Developer options menu to turn off
the""Disable absolute volume"". Disconnect and reconnect the two devices
through Bluetooth.
9. How to enter enhanced over-ear headphone mode(Ultra High mode)
and Desktop mode?
When the M15S is connected to fast charging adapter, the enhanced over-ear
headphone mode could be enabled. At this time, the system will pop up a
window to prompt the selection of Ultra High Mode and Desktop mode. And
the enhanced over-ear headphones mode will be added to the gain setting
menu. Please choose whether to switch according to your needs.
Ultra High Mode
The max output power will be1200mW@32Ω in the ultra high mode, and the
power supply of
the amp module will be increased to +7.6V.
Desktop mode
When the desktop mode is selected, the machine will be powered by USB, and
its battery will neither be charged nor powered, effectively increasing battery
life.
How to exit Desktop mode?
You could turn off the Desktop mode from system setting-General-Desktop
mode.
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