Since you cannot replace the OS, the community uses and software tweaks to achieve similar results. 🔋 Battery Life Optimization
However, the A105 has a dark secret. Out of the box, it is hobbled. Sony, in its infinite wisdom, pre-loads the device with "Sony Music Center" bloatware, aggressive battery optimization that kills background apps, and a regional volume cap that leaves many audiophones wanting more headroom. sony nw-a105 custom firmware
The A105 uses the premium digital amplifier. On stock firmware, it down-samples DSD to PCM and applies unnecessary resampling filters. Custom firmware can force bit-perfect playback. Since you cannot replace the OS, the community