Featured image of post PixelExperience 12 ALPHA 20211030-0435 Unofficial Polaris Build

PixelExperience 12 ALPHA 20211030-0435 Unofficial Polaris Build

Latest CAF S tag, screen recording frame drop fix, AOSP WiFi display, IFAA for Alipay fingerprint authentication, and passing SafetyNet.


  • This is an unofficial alpha build, and things are subject to change:
    • Unofficial because official release has not started
    • ALPHA because the source is still work in progress
  • Formatting data with PE recovery is REQUIRED for clean flash
    • DO NOT use any other recovery
    • The firmware is included with a different keymaster.img from perseus. DO NOT flash your own firmware.
    • Keymaster is bumped to 4.0 for encryption, and cust partition is mounted as /metadata. You WILL NOT be able to use TWRP/OrangeFox on PE12.
  • You can dirty flash from my previous PE 12 ALPHA builds.

PE recovery flash guide**

  • Download PE recovery provided below
  • Boot your phone into fastboot mode. You can either
    • hold power + volume down button
    • or adb reboot bootloader
    • or use the Reboot to bootloader option in TWRP/OrangeFox
  • Connect your phone to a computer
  • Run fastboot flash recovery pe_recovery_file_name.img in your cmd/powershell/terminal
  • Hold power + volume up to boot into recovery

PE 12 ALPHA flash guide**

  • Boot into PE recovery
  • Select Factory reset" --> "Format data/factory reset. You phone should say that /data, /cache, and /metadata have been formatted.
  • Go back to main menu and select “Apply update” –> “Apply from ADB”
  • Connect your phone to a computer
  • Run adb sideload in your cmd/powershell/terminal and wait until it finishes
  • Reboot to system

Device Specific Changes:

  • Etude kernel: Op.12 No.1
    • Linux 4.9.288
    • merged latest CAF android S tag LA.UM.10.3.r1-00300-sdm845.0
    • DO NOT use another kernel. Just don’t.
  • Switched to the latest display HAL and display commonsys-intf from the latest CAF S tag
    • a loop never increment build error has been fixed properly
  • Switched to the latest qcom sepolicy and sepolicy_vndr from the latest CAF S tag
    • sysprop owner issues have been addressed properly
  • Specified owner of device-specific vendor props
  • Fixed IFAA
    • Alipay biometric fingerprint authentication should work now
  • Switched to a forward-ported AOSP WiFi Display stack, as Qualcomm’s wfd is terribly broken for now
    • the feature set of AOSP WiFi display may not be fully on par with qcom’s implementation, but at least basic screen cast is working
  • Fixed frame drops in screen recording

Feature Update Highlights:

  • SafetyNet should be passing for now.

Known Issues

  • Rounded corner is broken. It does not seem to be an issue on the device side, as debug info reports correct values

Gapps are included.

PE recovery: Gdrive | 189 Cloud

PE ROM: Gdrive | 189 Cloud

Please report issues to jjpprrrr.

Licensed under CC BY-NC-SA 4.0
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