diff --git a/The-Ultimate-Rooting-Guide.md b/The-Ultimate-Rooting-Guide.md
index 19199b7..b75b46b 100644
--- a/The-Ultimate-Rooting-Guide.md
+++ b/The-Ultimate-Rooting-Guide.md
@@ -85,7 +85,7 @@ Your DPT will say `preparing for the update...` and then the DPT will restart an
 
 After update, it will say `update failure`, but it is actually flashed.
 
-And you can run `adb devices` on your computer to see if your DPT appears (it may take a while to show up after DPT boots up).
+And you can run `adb devices` on your computer to see if your DPT appears (it may take a while to boot ADBD after DPT boots up, if you have waited for >2min, try to unplug and plug back in the cable, and do `adb kill-server && adb devices` several times, it eventually will come up!).
 
 Note: we are still unclear about [the issue DPA cannot be connected](https://github.com/HappyZ/dpt-tools/issues/58).