[Google Pixel 4a ROMs, Kernels, Recoveries, & Other] PeterCxy:
Introduction

This is my personal build of LineageOS 18.1 for Pixel 4a with the microG patches applied. If you do not want / need to use microG, it may be a better idea to use the official build available here: https://download.lineageos.org/sunfish. This build is exactly the same as the official build except for the microG patch.

For discussion about the official build, please use the other thread instead: https://xdaforums.com/t/rom-official-sunfish-lineageos-18-1.4255751/

Installation

Before installation, make sure your phone is updated to Android 11 firmware on both of the slots.

Whether you are installing the ROM for the first time or updating the ROM, please make sure you reboot to recovery again after `adb sideload`-ing the ROM before installing add-ons such as Magisk and GAPPS.

1. Download `boot-XXXX.img` (this contains the recovery needed for initial flashing)

2. Download `lineage-18.1-XXXX-UNOFFICIAL-petercxy-sunfish.zip`

3. Reboot your phone to fastboot mode

4. Run `fastboot flash boot boot-XXXX.img` from your PC

5. Reboot your phone into recovery mode (`fastboot reboot`, then press volume up immediately)

6. Erase data

7. Select Apply Update -> Apply Update from ADB

8. Run `adb sideload lineage-18.1-XXXX-UNOFFICIAL-petercxy-sunfish.zip` and wait for installation to finish

9. If you do not need to install any add-ons (e.g. Magisk or GAPPS), then just reboot into system

10. Otherwise, if you do need to install add-ons, reboot into recovery again (this puts your phone into the recovery of the newly-installed system), then install the add-ons using sideload. If you want to use GAPPS, they must be installed here before you boot into system for the first time (this doesn't apply to microG).

11. Enjoy

Updating

1. Download the newly released zip and reboot your phone into recovery

2. Select Apply Update -> Apply Update from ADB

3. Run `adb sideload lineage-18.1-XXXX-UNOFFICIAL-petercxy-sunfish.zip` and wait for installation to finish

4. If you did not have any add-ons installed before update (e.g. Magisk or GAPPS), then just reboot into system

5. Otherwise, if you did, you need to reboot into recovery again at this point before rebooting to system and re-flash every single one of the add-ons you had before. If you do not re-flash them before rebooting to the new system, the boot will fail and your phone will switch back to the old system automatically.

6. Reboot and enjoy.

Note: You don't need to update official firmware manually while LineageOS is installed by flashing latest official factory images. This LineageOS build now ships with latest official firmware updates which are tested to work with the ROM. Please avoid flashing the firmware manually while LineageOS is installed to avoid unnecessary issues.

Known Issues

- Use Magisk v21.4 or later if you want Magisk

- Some applications require microG to be installed in system partition to function, in which case you can consider using the Magisk microG module

- The eSIM manager only works with either GAPPS or microG installed. Without them, you can use eSIM, but you will not be able to add / remove / rename / disable your eSIM. The eSIM manager will also crash once or twice on first boot without GAPPS or microG, but after that it won't crash anymore (the system automatically disables it until you install microG or GMS)

- Disabling / Enabling eSIM may hang even with GAPPS or microG. However, rebooting normally fixes the issue and makes your action effective.

- I provide no guarantee for SafetyNet status or compatibility with any app that requires SafetyNet. Google has been tightening its SafetyNet verification and there is really not much we can do about it, and frankly most apps that require SafetyNet should not have done so in the first place. If you need SafetyNet, you are on your own.

Downloads

Note: This build has compatibility issues with MindTheGapps (just like the recent LineageOS weekly builds). It will be fixed in newer official weekly builds, but since this build is for microG users, I am not going to upload a new microG-patched build just to work around a GAPPS compatibility issue.

20210610: June 05 security update; sorry for the delay, LineageOS had some issues while merging this month's ASB.

This update also fixed some long-standing bugs, such as the initial crash dialog of the eSIM manager (when GAPPS or microG is not installed), and the extraneous battery percentage option in settings -> battery. Read the LineageOS changelog for the full update.

- boot-20210610.img: https://mega.nz/file/TVolEYKL#MrJH-AVk37JDc_iKCVJ2lFGgFLG9czrE4FnJokbjnqI

- lineage-18.1-20210610-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/uYw30SxT#CwWc0GwqMYoAT54TJqPK2U7M8Y3OzhbpPuvejkOB65o

20210507: May 05 security patches

- boot-20210507.img: https://mega.nz/file/rcJVHQYZ#KjFu84Wnqdx4Rq0fd6TZUlJuaD-RXFXmMCJM4V4z0Tc

- lineage-18.1-20210507-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/jYBTESqZ#ZRc7CkUt8aUYgZRLpF6S1_LHdUXwcUOKPsCBorcYZ1w

20210410: April 05 security patches

- boot-20210410.img: https://mega.nz/file/eYggCKba#l7QJUMkvyEBtyptVMmWVbXochJKmY__X4VIwTla1KqE

- lineage-18.1-20210410-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/bUpQhAQJ#uTe-2nHLKYsfFBKuJg0VAYISUCGMTbIpaC9qjEHFZ1c

20210308: March 05 security patches and official firmware / binary updates.

- boot-20210308.img: https://mega.nz/file/WIZxjAwA#P77ZdJ2YEed5WWmlijKcyRMLJ30KG36eL0mhQGjZWjI

- lineage-18.1-20210308-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/eRBTkYzC#iNZUA84XR80V1so7YvjQ7TyJuZKGY9BZf-MGRtgQOH8

20210222: Updated sources; Removed some non-functional LiveDisplay features; Switched to using Google's wifi_ext HAL; Reserved more space in system partitions for potentially larger GAPPS packages

- boot-20210222.img: https://mega.nz/file/KVxRDY6L#7l7oejw-XEd_m1BUdp0_Z2TyHVLE2KkaGQ6g7Op7dpk

- lineage-18.1-20210222-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/mUgzGSbC#88q95qVsI-7RJsecM8L2MHZ6EwNXrs54Xk6yi428rjU

20210207: Updated LineageOS source; Applied 2021-02-05 security patches; Added support for glove mode; Enabled support property for Google Assistant; Optimized vibration

- boot-20210207.img: https://mega.nz/file/aZxlDKgC#_9VR2ruCYUqmX8gLCBKX1KSMAsBYFDsLA6utk5EjB-g

- lineage-18.1-20210207-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/yZpFQQRJ#PZlNYzI2t2fZdf1T3v6pMRi1zJe7J26f-Eu_Pohm7p4

20200118: Updated LineageOS source; Attempted to fix GAPPS bootlooping issue

- boot-20210118.img: https://mega.nz/file/ONYSRLKC#FhRYEhfsBndqcrJrhd1F4Tv3uu3UZNDYnQe3EcrMyC0

- lineage-18.1-20210118-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/3VRgwZQQ#ynCPIDbW42hXvBWp8MoG-R9eEEzvnaQ649ULZM8lrAc

20210109: Updated LineageOS sources and updated build fingerprint to January.

- boot-20210109.img: https://mega.nz/file/qU5T2CLY#A7dkDfRS0gUaKzphT2_mm0IHW9_-3cIR76yvNV1Cs4A

- lineage-18.1-20210109-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/GNwyxb4S#UGHclk8p60QuRWrGl3LI-Hur9X_VKF46tBNfuD0Z9-o

20210107:

1) Synchronized LineageOS updates and AOSP Jan 5 security patch

2) The ROM now ships with latest official firmware, so you won't need to worry about updating firmware separately (you still need latest official firmware when installing the ROM for the first time though)

- boot-20210107.img: https://mega.nz/file/OYRnwaII#3Ipj99mG5tpXouRRKMqWDJmimH8U2q5mZ5LKj8ZEmdo

- lineage-18.1-20210107-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/aEBTFAwK#EM3fKYQG4Y2najLhRkZlPqDwPSwkV-yfsSlH7Za7UYM

20201229: Synchronized LineageOS updates and fixed biometric authentication (fingerprint) in third-party applications.

- boot-20201229.img: https://mega.nz/file/yMow3aDb#ByY4yG6LeAquqBd2vu2UnZUz2xukHYjWbIfXnlkT_XM

- lineage-18.1-20201229-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/SA5WDAZQ#fMRB9w4LLSxSAGxHOtEmN9gRBTmrnF8ozKawM34cIxU

20201227:

- boot-20201227.img: https://mega.nz/file/6cI3lKKK#p8Nq3jUOsOoPDeV6yPj4hQtXGIHu8-D54_g3gkzdi0w

- lineage-18.1-20201227-UNOFFICIAL-petercxy-sunfish.zip: https://mega.nz/file/SdQnTaBa#83JjZojOS9JCRdYOng6Y0LLoUl8StAdrwsTbCSqAMhs

Sources

Device Tree: https://github.com/PeterCxy/android_device_google_sunfish

Kernel: https://github.com/PeterCxy/android_kernel_google_sunfish

Thanks

: DirtyUnicorn sunfish contributors, SuperiorOS sunfish contributors, LineageOS coral contributors and the LineagOS community.