Need to delete instance.img to switch to debug VM
Update the docs to make it clear that switching a VM to --debug=full
requires the instance.img file to be deleted first, or the VM will
fail to start.
Test: N/A
Change-Id: Ia4df6c5105f83a5698fab2bbce855e02eda31b22
diff --git a/microdroid/README.md b/microdroid/README.md
index 6e5d709..fef71ce 100644
--- a/microdroid/README.md
+++ b/microdroid/README.md
@@ -162,8 +162,9 @@
## ADB
On userdebug builds, you can have an adb connection to microdroid. To do so,
-first, add the `--debug=full` flag to the `/apex/com.android.virt/bin/vm
-run-app` command, and then
+first, delete `$TEST_ROOT/instance.img`; this is because changing debug settings
+requires a new instance. Then add the `--debug=full` flag to the
+`/apex/com.android.virt/bin/vm run-app` command, and then
```sh
adb forward tcp:8000 vsock:$CID:5555