diff --git a/finalize-locally-mainline-sdk.sh b/finalize-locally-mainline-sdk.sh
new file mode 100755
index 0000000..5285a05
--- /dev/null
+++ b/finalize-locally-mainline-sdk.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -ex
+
+function finalize_locally_mainline_sdk() {
+    local MAINLINE_EXTENSION='6'
+
+    local top="$(dirname "$0")"/../..
+
+    # Bump SDK extension version.
+    "$top/packages/modules/SdkExtensions/gen_sdk/bump_sdk.sh" ${MAINLINE_EXTENSION}
+
+    local version_defaults="$top/build/make/core/version_defaults.mk"
+    sed -i -e "s/PLATFORM_SDK_EXTENSION_VERSION := .*/PLATFORM_SDK_EXTENSION_VERSION := ${MAINLINE_EXTENSION}/g" $version_defaults
+
+    # Build modules SDKs.
+    TARGET_BUILD_VARIANT=userdebug UNBUNDLED_BUILD_SDKS_FROM_SOURCE=true "$top/vendor/google/build/mainline_modules_sdks.sh"
+
+    # Update prebuilts.
+    "$top/packages/modules/common/tools/finalize_sdk.py" -l -b 0 -f ${MAINLINE_EXTENSION} -r '' 0
+}
+
+finalize_locally_mainline_sdk
+
diff --git a/finalize-sdk-rel.sh b/finalize-sdk-rel.sh
index 35899f7..b19e56a 100755
--- a/finalize-sdk-rel.sh
+++ b/finalize-sdk-rel.sh
@@ -14,7 +14,7 @@
 
     # adb keys
     $m adb
-    LOGNAME=android-eng HOSTNAME=google.com adb keygen "$DEV_SRC_DIR/vendor/google/security/adb/${PLATFORM_VERSION}.adb_key"
+    LOGNAME=android-eng HOSTNAME=google.com "$DEV_SRC_DIR/out/host/linux-x86/bin/adb" keygen "$DEV_SRC_DIR/vendor/google/security/adb/${PLATFORM_VERSION}.adb_key"
 
     # build/make/core/version_defaults.mk
     sed -i -e "s/PLATFORM_VERSION_CODENAME.${BUILD_PREFIX} := .*/PLATFORM_VERSION_CODENAME.${BUILD_PREFIX} := REL/g" "$DEV_SRC_DIR/build/make/core/version_defaults.mk"
@@ -29,13 +29,13 @@
     cp -r "$DEV_SRC_DIR/system/sepolicy/private/" "$DEV_SRC_DIR/system/sepolicy/prebuilts/api/${PLATFORM_SDK_VERSION}.0/"
 
     # prebuilts/abi-dumps/ndk
-    git -C "$DEV_SRC_DIR/prebuilts/abi-dumps/ndk" mv current ${PLATFORM_SDK_VERSION}
+    mv "$DEV_SRC_DIR/prebuilts/abi-dumps/ndk/current" "$DEV_SRC_DIR/prebuilts/abi-dumps/ndk/$PLATFORM_SDK_VERSION"
 
     # prebuilts/abi-dumps/vndk
-    git -C "$DEV_SRC_DIR/prebuilts/abi-dumps/vndk" mv ${PLATFORM_CODENAME} ${PLATFORM_SDK_VERSION}
+    mv "$DEV_SRC_DIR/prebuilts/abi-dumps/vndk/$PLATFORM_CODENAME" "$DEV_SRC_DIR/prebuilts/abi-dumps/vndk/$PLATFORM_SDK_VERSION"
 
     # prebuilts/abi-dumps/platform
-    git -C "$DEV_SRC_DIR/prebuilts/abi-dumps/platform" mv current ${PLATFORM_SDK_VERSION}
+    mv "$DEV_SRC_DIR/prebuilts/abi-dumps/platform/current" "$DEV_SRC_DIR/prebuilts/abi-dumps/platform/$PLATFORM_SDK_VERSION"
 }
 
 finalize_sdk_rel
diff --git a/finalize-step-1-for-build-target.sh b/finalize-step-1-for-build-target.sh
index 52cf0a7..8b35a1d 100755
--- a/finalize-step-1-for-build-target.sh
+++ b/finalize-step-1-for-build-target.sh
@@ -4,49 +4,10 @@
 
 set -ex
 
-function revert_to_unfinalized_state() {
-    declare -a projects=(
-        "build/make/"
-        "build/soong/"
-        "cts/"
-        "frameworks/base/"
-        "frameworks/hardware/interfaces/"
-        "frameworks/libs/modules-utils/"
-        "frameworks/libs/net/"
-        "hardware/interfaces/"
-        "libcore/"
-        "packages/services/Car/"
-        "platform_testing/"
-        "prebuilts/abi-dumps/ndk/"
-        "prebuilts/abi-dumps/platform/"
-        "prebuilts/abi-dumps/vndk/"
-        "system/hardware/interfaces/"
-        "system/tools/aidl/"
-        "tools/platform-compat"
-        "device/generic/car"
-        "development"
-    )
-
-    for project in "${projects[@]}"
-    do
-        local git_path="$top/$project"
-        echo "Reverting: $git_path"
-        baselineHash="$(git -C $git_path log --format=%H --no-merges --max-count=1 --grep ^FINALIZATION_STEP_1_BASELINE_COMMIT)" ;
-        if [[ $baselineHash ]]; then
-          previousHash="$(git -C $git_path log --format=%H --no-merges --max-count=100 --grep ^FINALIZATION_STEP_1_SCRIPT_COMMIT $baselineHash..HEAD | tr \n \040)" ;
-        else
-          previousHash="$(git -C $git_path log --format=%H --no-merges --max-count=100 --grep ^FINALIZATION_STEP_1_SCRIPT_COMMIT | tr \n \040)" ;
-        fi ;
-        if [[ $previousHash ]]; then git -C $git_path revert --no-commit --strategy=ort --strategy-option=ours $previousHash ; fi ;
-    done
-}
-
 function finalize_step_1_main() {
     local top="$(dirname "$0")"/../..
     local m="$top/build/soong/soong_ui.bash --make-mode TARGET_PRODUCT=aosp_arm64 TARGET_BUILD_VARIANT=userdebug"
 
-    revert_to_unfinalized_state
-
     # vndk etc finalization
     source $top/build/make/finalize-aidl-vndk-sdk-resources.sh
 
diff --git a/finalize-step-1.sh b/finalize-step-1.sh
index 20bc2bf..8871862 100755
--- a/finalize-step-1.sh
+++ b/finalize-step-1.sh
@@ -32,6 +32,9 @@
 }
 
 function finalize_step_1_main() {
+    # deprecated, do not use
+    exit 1
+
     local top="$(dirname "$0")"/../..
 
     repo selfupdate
diff --git a/finalize-step-2-for-build-target.sh b/finalize-step-2-for-build-target.sh
index caf415f..d932b14 100755
--- a/finalize-step-2-for-build-target.sh
+++ b/finalize-step-2-for-build-target.sh
@@ -4,43 +4,6 @@
 
 set -ex
 
-function revert_to_unfinalized_state() {
-    declare -a projects=(
-        "build/make/"
-        "build/soong/"
-        "cts/"
-        "frameworks/base/"
-        "frameworks/hardware/interfaces/"
-        "frameworks/libs/modules-utils/"
-        "frameworks/libs/net/"
-        "hardware/interfaces/"
-        "libcore/"
-        "packages/services/Car/"
-        "platform_testing/"
-        "prebuilts/abi-dumps/ndk/"
-        "prebuilts/abi-dumps/platform/"
-        "prebuilts/abi-dumps/vndk/"
-        "system/hardware/interfaces/"
-        "system/tools/aidl/"
-        "tools/platform-compat"
-        "device/generic/car"
-        "development"
-    )
-
-    for project in "${projects[@]}"
-    do
-        local git_path="$top/$project"
-        echo "Reverting: $git_path"
-        baselineHash="$(git -C $git_path log --format=%H --no-merges --max-count=1 --grep ^FINALIZATION_STEP_1_BASELINE_COMMIT)" ;
-        if [[ $baselineHash ]]; then
-          previousHash="$(git -C $git_path log --format=%H --no-merges --max-count=100 --grep ^FINALIZATION_STEP_1_SCRIPT_COMMIT $baselineHash..HEAD | tr \n \040)" ;
-        else
-          previousHash="$(git -C $git_path log --format=%H --no-merges --max-count=100 --grep ^FINALIZATION_STEP_1_SCRIPT_COMMIT | tr \n \040)" ;
-        fi ;
-        if [[ $previousHash ]]; then git -C $git_path revert --no-commit --strategy=ort --strategy-option=ours $previousHash ; fi ;
-    done
-}
-
 function finalize_step_2_main() {
     local top="$(dirname "$0")"/../..
     local m="$top/build/soong/soong_ui.bash --make-mode TARGET_PRODUCT=aosp_arm64 TARGET_BUILD_VARIANT=userdebug"
@@ -53,6 +16,9 @@
     # prebuilts etc
     source $top/build/make/finalize-sdk-rel.sh
 
+    # mainline sdk prebuilts
+    source $top/build/make/finalize-locally-mainline-sdk.sh
+
     # build to confirm everything is OK
     AIDL_FROZEN_REL=true $m
 }
diff --git a/finalize-step-2.sh b/finalize-step-2.sh
index 627153b..ef80b2b 100755
--- a/finalize-step-2.sh
+++ b/finalize-step-2.sh
@@ -32,6 +32,9 @@
 }
 
 function finalize_step_2_main() {
+    # deprecated, do not use
+    exit 1
+
     local top="$(dirname "$0")"/../..
 
     repo selfupdate