[Huawei P20 Pro ROMs, Kernels, Recoveries, & Other ] depl0y:
One thing that I noticed is that I can't get ARCore (or Google Play Services for AR) to work. As soon as I enable AR in an app (tried multiple) I get the error "ARCore encountered a problem connecting. Please start the app again".

I am running on a CLT-L29C432 with LineageOS 6.0-20191019. And this is what I capture using adb:

10-25 06:46:48.518 2589 2614 E native : #######################################################
10-25 06:46:48.518 2589 2614 E native : ARCore Fatal Error
10-25 06:46:48.518 2589 2614 E native : Copy paste the block below until END
10-25 06:46:48.518 2589 2614 E native : ###################### BUILD ID ######################
10-25 06:46:48.518 2589 2614 E native : BUILD_USERNAME build-secure BUILD_HOSTNAME oxqp15.prod.google.com BUILD_DIRECTORY /export/hda3/borglet/remote_hdd_fs_dirs/rabbit-prod.secure-alloc.build-secure.122.523780043656.14b334fb3717c109/mount/tmpfs/rabbit/workspaces/9424700380019963443/g$
10-25 06:46:48.518 2589 2614 E native : ######################## BEGIN #######################
10-25 06:46:48.518 2589 2614 E native : ARCoreError: third_party/arcore/ar/core/android/implementation/session_create_implementation.cc:310 https://cs.corp.google.com/piper///depot/google3/third_party/arcore/ar/core/android/implementation/session_create_implementation.cc?g=0&l=310
10-25 06:46:48.518 2589 2614 E native : ######################### END ########################
10-25 06:46:48.518 2589 2614 E native :
10-25 06:46:48.518 2589 2614 E ArPresto: ArPresto::ArCore session creation failed.

And another app

10-25 06:54:02.733 3464 3541 E native : #######################################################
10-25 06:54:02.733 3464 3541 E native : ARCore Fatal Error
10-25 06:54:02.733 3464 3541 E native : Copy paste the block below until END
10-25 06:54:02.733 3464 3541 E native : ###################### BUILD ID ######################
10-25 06:54:02.733 3464 3541 E native : BUILD_USERNAME build-secure BUILD_HOSTNAME oxqp15.prod.google.com BUILD_DIRECTORY /export/hda3/borglet/remote_hdd_fs_dirs/rabbit-prod.secure-alloc.build-secure.122.523780043656.14b334fb3717c109/mount/tmpfs/rabbit/workspaces/9424700380019963443/google3 BUILD_EMBED_LABEL arcore_1.13_20191007_RC009 BUILD_BLAZE_RELEASE release blaze-2019.09.28-1 (mainline @271678982) WORKSPACE_STATUS_COMMAND_ARGUMENT /export/hda3/borglet/remote_hdd_fs_dirs/rabbit-prod.secure-alloc.build-secure.122.523780043656.14b334fb3717c109/mount/tmpfs/rabbit/workspaces/9424700380019963443/-oxqp15-ab198-677138-a71e6b4d49e6a-5950e5013f2ca_embed_changelist_ VERIFIABLE 1 BUILD_CLIENT build-secure-info:source-uri BUILD_DEPOT_PATH //depot/branches/vr_arcore_release_branch/273204670.2/google3 BUILD_CLIENT_MINT_STATUS 1 BUILD_USERNAME vr-builder BUILD_DIRECTORY /google/src/files/275101410/depot/branches/vr_arcore_release_branch/273204670.2/OVERLAY_READONLY/google3 BUILD_ID c65749c8-6ed1-4a81-9bee-95436d9d85b0 BUILD_REQUEST_ID bbq-024cd6df-c70e-4122-8de6-01e57ed0563d SRCFSD_TASK_BNS /bns/ox/borg/ox/bns/build-secure/rabbit-prod.secure-srcfsd/122 BUILDRABBIT_DEBUG_BBQID http://go/bbqid?uuid=bbq-024cd6df-c70e-4122-8de6-01e57ed0563d BUILDRABBIT_TASK_BNS /bns/ox/borg/ox/bns/build-secure/rabbit-prod.secure-worker/122 BUILD_BASELINE_CHANGELIST 273204670 BUILDRABBIT_DEBUG_BUILD_ID http://go/buildrabbit-build-id/c65749c8-6ed1-4a81-9bee-95436d9d85b0 SOURCE_URI googlefile:/google_src/files/275101410/depot/branches/vr_arcore_release_branch/273204670.2/OVERLAY_READONLY/google3 BUILDRABBIT_BLAZE_BINARY_PATH /google/src/files/275101410/depot/branches/vr_arcore_release_branch/273204670.2/OVERLAY_READONLY/google3/tools/blaze BUILD_REQUEST_ID bbq-024cd6df-c70e-4122-8de6-01e57ed0563d OBJFSD_TASK_BNS /bns/ox/borg/ox/bns/build-secure/rabbit-prod.secure-objfsd/122 BUILD_VERSION_MAP map 0 { // } BUILD_CHANGELIST 275101410 BUILD_WORKER_VERSION buildrabbit-worker_20191011_0_RC00 BUILDRABBIT_DEBUG_LOG_ARCHIVE_DIR http://cnsviewer/cns/ox-d/home/build-logs/log_archives/c6/c65749c8-6ed1-4a81-9bee-95436d9d85b0
10-25 06:54:02.733 3464 3541 E native : ######################## BEGIN #######################
10-25 06:54:02.733 3464 3541 E native : ARCoreError: third_party/arcore/ar/core/android/implementation/session_create_implementation.cc:310	https://cs.corp.google.com/piper///depot/google3/third_party/arcore/ar/core/android/implementation/session_create_implementation.cc?g=0&l=310
10-25 06:54:02.733 3464 3541 E native : ######################### END ########################

It seems it doesn't find the LineageOS compatibility profiles:

10-25 06:54:02.697 2438 2504 W ARCore-ContentProvider: No usable local profile
10-25 06:54:02.724 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for Z9vKg4
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for lineage_charlotte/charlotte_SFP_accelerometer-icm20690_LITEON_SFP
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for aVYUfB
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for charlotte_SFP_accelerometer-icm20690_LITEON_SFP
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for JuaZTm
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for lineage_charlotte/charlotte
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for 6vimTP
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:489 Found nothing for charlotte
10-25 06:54:02.726 2438 2504 I native : device_profile_database_helpers.cc:491 Could not locate device profile for Huawei/lineage_charlotte/charlotte_SFP_accelerometer-icm20690_LITEON_SFP:9/PQ3A.190801.002/253f3c62a8:userdebug/release-keys
10-25 06:54:02.726 2438 2504 E native : calibration_jni.cc:210 No device profile available for build fingerprint Huawei/lineage_charlotte/charlotte_SFP_accelerometer-icm20690_LITEON_SFP:9/PQ3A.190801.002/253f3c62a8:userdebug/release-keys
10-25 06:54:02.729 3464 3541 E native : session_create_implementation_shared.cc:794 Unable to obtain device profile from the content provider: generic::not_found: Device is not supported.
10-25 06:54:02.729 3464 3541 E native : session_create_implementation_shared.cc:1927 Failed to create calibration provider.
10-25 06:54:02.731 3464 3541 W native : session_create_implementation_shared.cc:1928 CreateLiveDataSourceAndDeps returning ArStatusErrorSpace::AR_UNAVAILABLE_DEVICE_NOT_COMPATIBLE: .
10-25 06:54:02.731 3464 3894 V third_party/redwood/base/jni_common/jni_helper.cc: ~JniHelper: about to detach thread (Called from line 318).
10-25 06:54:02.732 3464 3894 V third_party/redwood/base/jni_common/jni_helper.cc: ~JniHelper: detached thread (Called from line 318).

Another problem I have, is that I do not know how to update to the latest version. I tried sideloading a new version OVER this version, but this ends in a boot loop to TWRP. OTA did not work for me either.