True audiophiles know the frustration of the Android Sample Rate Conversion (SRC) bottleneck. By default, Android forces your pristine Hi-Res audio tracks to downsample to 48kHz, ruining bit-perfect playback. USB Samplerate Unlocker by zyhk fixes this natively. This elegant systemless module dynamically alters the Android audio policy, bypassing the OS mixer and unlocking direct, unadulterated high-resolution output to your external USB DAC.
Unleash Bit-Perfect Audio
A crucial tuning utility for high-fidelity listeners, maximizing the hardware capabilities of premium external USB amplifiers.
SRC Bypass
Effectively disables the notorious Android Sample Rate Conversion restriction, stopping the OS from artificially crushing your audio to 48kHz.
Native DAC Support
Ensures your USB DAC receives the raw, untouched bitstream directly from the player. Perfect for premium dongles and desktop audio setups.
Audiophile Grade
Essential for users subscribing to Hi-Res streaming services like Tidal, Qobuz, or Apple Music Lossless, unlocking true 192kHz/384kHz and DSD transmission.
Universal Root Sync
Compatible across a vast array of systemless root frameworks. Flash safely on devices utilizing Magisk, KernelSU, APatch, or KSUNext.
Automated XML Patching
Intelligently searches and modifies complex audio policy configurations on the fly. It adapts to different OEM setups without needing manual file editing.
Ultralight Footprint
Clocking in at under 20 KB, the script applies its modifications instantly during system initialization and then exits, consuming zero background RAM.
Under the Hood: Systemless Policy Injection
Android relies heavily on a hardware abstraction layer (HAL) configuration file, typically named audio_policy_configuration.xml, to dictate how the system handles audio outputs. By default, USB audio routing policies in this file limit the sampling frequency and bit depth to ensure basic compatibility across all apps.
USB Samplerate Unlocker uses a sophisticated `sed` and `awk` scripting logic during boot to locate these active configuration files. It systemlessly binds over the original files and injects dynamic profiles that declare support for extreme sampling rates (up to 384kHz/768kHz) and 24/32-bit depth formats for the USB output node.
Dynamic SamplingUSB Output Nodeusb_device audio profile path. It does not affect Bluetooth (A2DP) or internal speaker routing, preserving standard device behavior.Frequently Asked Questions
audio_policy_configuration.xml and related audio HAL files on the fly during boot. It does not overwrite any read-only system partitions, ensuring OTA safety and easy uninstallation.