diff --git a/apex/Android.bp b/apex/Android.bp
index f1eeed9..25cd480 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -5,6 +5,7 @@
 microdroid_filesystem_images = [
     "microdroid_super",
     "microdroid_boot-5.10",
+    "microdroid_init_boot",
     "microdroid_vendor_boot-5.10",
     "microdroid_vbmeta",
     "microdroid_vbmeta_bootconfig",
diff --git a/apex/sign_virt_apex.py b/apex/sign_virt_apex.py
index 153b5dd..9a0fe1a 100644
--- a/apex/sign_virt_apex.py
+++ b/apex/sign_virt_apex.py
@@ -282,6 +282,8 @@
     boot_img = os.path.join(input_dir, 'etc', 'fs', 'microdroid_boot-5.10.img')
     vendor_boot_img = os.path.join(
         input_dir, 'etc', 'fs', 'microdroid_vendor_boot-5.10.img')
+    init_boot_img = os.path.join(
+        input_dir, 'etc', 'fs', 'microdroid_init_boot.img')
     super_img = os.path.join(input_dir, 'etc', 'fs', 'microdroid_super.img')
     vbmeta_img = os.path.join(input_dir, 'etc', 'fs', 'microdroid_vbmeta.img')
     vbmeta_bootconfig_img = os.path.join(
@@ -297,10 +299,11 @@
     # while it's okay to use different keys for other image files.
     ReplaceBootloaderPubkey(args, key, bootloader, bootloader_pubkey)
 
-    # re-sign bootloader, boot.img, vendor_boot.img
+    # re-sign bootloader, boot.img, vendor_boot.img, and init_boot.img
     AddHashFooter(args, key, bootloader)
     AddHashFooter(args, key, boot_img)
     AddHashFooter(args, key, vendor_boot_img)
+    AddHashFooter(args, key, init_boot_img)
 
     # re-sign super.img
     with TempDirectory() as work_dir:
@@ -320,12 +323,12 @@
         # re-pack super.img
         MakeSuperImage(args, partitions, super_img)
 
-        # re-generate vbmeta from re-signed {boot, vendor_boot, system_a, vendor_a}.img
+        # re-generate vbmeta from re-signed {boot, vendor_boot, init_boot, system_a, vendor_a}.img
         # Ideally, making VBmeta should be done out of TempDirectory block. But doing it here
         # to avoid unpacking re-signed super.img for system/vendor images which are available
         # in this block.
         MakeVbmetaImage(args, key, vbmeta_img, images=[
-                        boot_img, vendor_boot_img, system_a_img, vendor_a_img])
+                        boot_img, vendor_boot_img, init_boot_img, system_a_img, vendor_a_img])
 
     # Re-sign bootconfigs with the same key
     bootconfig_sign_key = key
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 3eaf124..6c96cbf 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -221,7 +221,6 @@
 
 bootimg {
     name: "microdroid_boot-5.10",
-    ramdisk_module: "microdroid_ramdisk-5.10",
     // We don't have kernel for arm and x86. But Soong demands one when it builds for
     // arm or x86 target. Satisfy that by providing an empty file as the kernel.
     kernel_prebuilt: "empty_kernel",
@@ -251,6 +250,16 @@
     avb_private_key: ":microdroid_sign_key",
 }
 
+bootimg {
+    name: "microdroid_init_boot",
+    ramdisk_module: "microdroid_ramdisk-5.10",
+    kernel_prebuilt: "empty_kernel",
+    header_version: "4",
+    partition_name: "init_boot",
+    use_avb: true,
+    avb_private_key: ":microdroid_sign_key",
+}
+
 android_filesystem {
     name: "microdroid_ramdisk-5.10",
     deps: [
@@ -551,6 +560,7 @@
         "microdroid_vendor_boot-5.10",
         "microdroid",
         "microdroid_boot-5.10",
+        "microdroid_init_boot",
     ],
 }
 
diff --git a/microdroid/microdroid.json b/microdroid/microdroid.json
index 8496052..9e630f8 100644
--- a/microdroid/microdroid.json
+++ b/microdroid/microdroid.json
@@ -8,6 +8,10 @@
           "path": "/apex/com.android.virt/etc/fs/microdroid_boot-5.10.img"
         },
         {
+          "label": "init_boot_a",
+          "path": "/apex/com.android.virt/etc/fs/microdroid_init_boot.img"
+        },
+        {
           "label": "vendor_boot_a",
           "path": "/apex/com.android.virt/etc/fs/microdroid_vendor_boot-5.10.img"
         },