Note

• 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 on PE 12.1. OrangeFox R11.1_1 or newer can boot but is not capable of decrypting the data partition.
  • To switch to other ROMs, format data in PE recovery first, and then install another recovery. You may need to re-flash the required firmware, if the ROM you are going to flash does not include one.
• You can dirty flash from my previous PE 12 or 12.1 builds.
• You cannot upgrade from android 11 directly. Formatting data is required.

PE recovery flash guide

• Download PE recovery from the official PE website
• 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 12.1 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 pe_rom_file_name.zip in your cmd/powershell/terminal and wait until it finishes
• Reboot to system

Device Specific Changes

• Etude kernel: Op.12 No.2
  • Linux 4.9.309
  • CAF tag LA.UM.10.3.r1-01000-sdm845.0
  • set compiler flag to optimize for cortex-a55 to avoid performance regression on the in-order little cluster
  • DO NOT use another kernel. Just don’t.
• Changed soong build flags for Kryo385 (Qualcomm’s codename for sdm845’s CPU clusters)
  • added a previously missing nodotprod flag
  • optimize for cortex-a55 instruction model to avoid performance regression on the little cluster
• Properly override system product name
• Dropped deprecated binder flag
• Adapted aux camera prop sepolicy for the new change

ROM Side Changes

• Initial android 12.1 release. The source code is fully cleaned and rebased upon android 12.1
• March security patch
• Fixed several face unlock issues. For example, initial setup wizard no longer requires you to enroll in face unlock when you have lockscreen password.
• Many other fixes and improvements
• Plus edition is delayed to April.

Known Issues

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

Download | XDA thread

Please report issues to jjpprrrr.