diff --git a/docs/custom_vm.md b/docs/custom_vm.md
index cdeddf5..e10799a 100644
--- a/docs/custom_vm.md
+++ b/docs/custom_vm.md
@@ -25,19 +25,21 @@
 The `vm` command also has other subcommands for debugging; run
 `/apex/com.android.virt/bin/vm help` for details.
 
-### Running Debian with u-boot
-1. Prepare u-boot binary from `u-boot_crosvm_aarch64` in https://ci.android.com/builds/branches/aosp_u-boot-mainline/grid
-or build it by https://source.android.com/docs/devices/cuttlefish/bootloader-dev#develop-bootloader
-2. Prepare Debian image from https://cloud.debian.org/images/cloud/ (We tested nocloud image)
-3. Copy `u-boot.bin`, Debian image file(like `debian-12-nocloud-arm64.raw`) and `vm_config.json` to `/data/local/tmp`
+### Running Debian
+1. Prepare Debian image from https://cloud.debian.org/images/cloud/ (We tested nocloud image)
+2. (Optional) Resize the image if necessary
+```
+truncate -s 20G ./debian.img
+virt-resize --expand /dev/sda1 ./debian-12-nocloud-arm64.raw ./debian.img
+```
+3. Copy Debian image file(like `debian-12-nocloud-arm64.raw`) and `vm_config.json` to `/data/local/tmp`
 ```shell
 cat > vm_config.json <<EOF
 {
     "name": "debian",
-    "bootloader": "/data/local/tmp/u-boot.bin",
     "disks": [
         {
-            "image": "/data/local/tmp/debian-12-nocloud-arm64.raw",
+            "image": "/data/local/tmp/debian-12-nocloud-arm64.raw", # or debian.img if you resized the image.
             "partitions": [],
             "writable": true
         }
@@ -45,14 +47,49 @@
     "protected": false,
     "cpu_topology": "match_host",
     "platform_version": "~1.0",
-    "memory_mib" : 8096
+    "memory_mib": 8096,
+    "debuggable": true,
+    "console_out": true,
+    "connect_console": true,
+    "console_input_device": "ttyS0",
+    "network": true,
+    "input": {
+        "touchscreen": true,
+        "keyboard": true,
+        "mouse": true,
+        "trackpad": true,
+        "switches": true
+    },
+    "audio": {
+        "speaker": true,
+         "microphone": true
+    },
+    "gpu": {
+        "backend": "virglrenderer",
+        "context_types": ["virgl2"]
+    },
+    "display": {
+        "refresh_rate": "30"
+    }
 }
 EOF
-adb push `u-boot.bin` /data/local/tmp
-adb push `debian-12-nocloud-arm64.raw` /data/local/tmp
+adb push debian-12-nocloud-arm64.raw /data/local/tmp # or debian.img
 adb push vm_config.json /data/local/tmp/vm_config.json
 ```
 4. Launch VmLauncherApp(the detail will be explain below)
+5. For console, we can refer to `Debugging` section below. (id: root)
+5. For graphical shell, you need to install xfce(for now, only xfce is tested)
+```
+apt install task-xfce-desktop
+dpkg --configure -a (if necessary)
+systemctl set-default graphical.target
+
+# need non-root user for graphical shell
+adduser linux
+# optional
+adduser linux sudo
+reboot
+```
 
 ## Graphical VMs