Device Changelog :- 

- Add support for 32/48KHz voip
- Add path hph-lowpower-mode
- Increase in-call earpiece volume
- Move/Add rild properties to system.prop 
- Update Graphics & Camera firmware from Daisy 
- Enable AOSP low_latency in audio output config
- Add missing net_raw to pm-service
- Enable ro.telephony.use_old_mnc_mcc_format
- Remove qti_libpermissions.xml
- Drop QMI libqmi_cci_system blobs
- Add voip_tx profile to policy conf
- Drop AUDIO_FEATURE_ENABLED_AUDIOSPHERE
- Add audiosphere effect support
- sepolicy: address per_mgr denial 
- Fix a wcnss_service denial
- Fix VoLTE in SIM Slot 2
- XiaomiParts: Add Audio High Performance mode toggle
- XiaomiParts: Add MSM Thermal Control
- Remove via Browser
- Pin critical system apps that always need to be responsive, no
mattter what
- Update blobs from LA.UM.8.6.r1-04400-89xx.0 
- Update GPS configs from LA.UM.8.6.r1-04400-89xx.0
- Update RIL permissions from LA.UM.8.6.r1-04400-89xx.0
- Add Audiosphere blobs from LA.UM.8.6.r1-04400-89xx.0
- Remove Zygote preforking prop

Source Changelog :-

* Added back button for freeform window
* Updated Icon for Heads up QS tile
* Updated PA VolumePanel to 1.1:
   - Added support for unlinked notification volume
   - Fixed progress bar inconsistencies when switching ringer modes
   - Some minor animation tweaks
* Made ringer button hidden if alert slider is present
* Switched to better drawables for notification volume
* Switched to same icons for sliders in Settings as fw_base
* Improved switch for linked ring and media notification volumes
* Reworked gestures page
* Allowed StitchImage to take screenshot on home screen
* Force enabled PermissionBar Chart in Security settings
* Added some ART optimizations
* Updated GMS updater component disable list (Google has introduced new components)