Featured image of post PixelExperience 12 ALPHA 20211108-0647 Unofficial Polaris Build

PixelExperience 12 ALPHA 20211108-0647 Unofficial Polaris Build

Dual SIM selection fix, Cpuset/SchedTune Assist drop, and optimization profile settings fix.


  • 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 boot TWRP/OrangeFox on PE12.

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:
    • dropped Cpuset Assist and SchedTune Assist because proper values will be set from userspace init
    • DO NOT use another kernel. Just don’t.
  • Set cpuset values from init
  • Fixed the issue of the second SIM card not showing up in mobile network selection page
  • Fixed the issue of optimization profiles in Settings/Battery auto reset after reboot

Feature Update Highlights:

  • Nothing significant

Known Issues

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

Gapps are included.

SHA256: 3d913793d4f45c5b09a5f3cce8c39c35518b86e614e4f514ad0baa9cc7a38411

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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