diff --git a/.github/scripts/build_a12.sh b/.github/scripts/build_a12.sh
index 17036947..83ed1b12 100644
--- a/.github/scripts/build_a12.sh
+++ b/.github/scripts/build_a12.sh
@@ -11,7 +11,15 @@ build_from_image() {
 	echo "[+] patch level: $PATCH_LEVEL"
 
 	echo '[+] Download prebuilt ramdisk'
-	curl -Lo gki-kernel.zip https://dl.google.com/android/gki/gki-certified-boot-android12-5.10-"${PATCH_LEVEL}"_r1.zip
+    GKI_URL=https://dl.google.com/android/gki/gki-certified-boot-android12-5.10-"${PATCH_LEVEL}"_r1.zip
+    FALLBACK_URL=https://dl.google.com/android/gki/gki-certified-boot-android12-5.10-2023-01_r1.zip
+    status=$(curl -sL -w "%{http_code}" "$GKI_URL" -o /dev/null)
+    if [ "$status" = "200" ]; then
+        curl -Lo gki-kernel.zip "$GKI_URL"
+    else
+        echo "[+] $GKI_URL not found, using $FALLBACK_URL"
+        curl -Lo gki-kernel.zip "$FALLBACK_URL"
+    fi
 	unzip gki-kernel.zip && rm gki-kernel.zip
 
 	echo '[+] Unpack prebuilt boot.img'
diff --git a/.github/workflows/build-kernel-a12.yml b/.github/workflows/build-kernel-a12.yml
index 3548d551..3fbf32e5 100644
--- a/.github/workflows/build-kernel-a12.yml
+++ b/.github/workflows/build-kernel-a12.yml
@@ -21,6 +21,14 @@ jobs:
     strategy:
       matrix:
         include:
+          - sub_level: 66
+            os_patch_level: 2021-11
+          - sub_level: 81
+            os_patch_level: 2022-03
+          - sub_level: 101
+            os_patch_level: 2022-05
+          - sub_level: 110
+            os_patch_level: 2022-07
           - sub_level: 136
             os_patch_level: 2022-11
           - sub_level: 149
diff --git a/.github/workflows/build-kernel-a13.yml b/.github/workflows/build-kernel-a13.yml
index d52da8ea..2994d984 100644
--- a/.github/workflows/build-kernel-a13.yml
+++ b/.github/workflows/build-kernel-a13.yml
@@ -36,6 +36,9 @@ jobs:
           - version: "5.10"
             sub_level: 177
             os_patch_level: 2023-06
+          - version: "5.15"
+            sub_level: 41
+            os_patch_level: 2022-11
           - version: "5.15"
             sub_level: 74
             os_patch_level: 2023-01
diff --git a/.github/workflows/gki-kernel.yml b/.github/workflows/gki-kernel.yml
index 63005feb..6d5265fe 100644
--- a/.github/workflows/gki-kernel.yml
+++ b/.github/workflows/gki-kernel.yml
@@ -90,6 +90,12 @@ jobs:
           git clone https://gerrit.googlesource.com/git-repo
           mkdir android-kernel && cd android-kernel
           ../git-repo/repo init --depth=1 --u https://android.googlesource.com/kernel/manifest -b common-${{ inputs.tag }}
+          REMOTE_BRANCH=$(git ls-remote https://android.googlesource.com/kernel/common ${{ inputs.tag }})
+          if grep -q deprecated <<< $REMOTE_BRANCH; then
+            echo "Found deprecated branch: ${{ inputs.tag }}"
+            sed -i 's/"${{ inputs.tag }}"/"deprecated\/${{ inputs.tag }}"/g' .repo/manifests/default.xml
+            cat .repo/manifests/default.xml
+          fi
           ../git-repo/repo sync -j$(nproc --all)
 
       - name: Setup KernelSU