diff --git a/tools/harness-thci/OpenThread.py b/tools/harness-thci/OpenThread.py
index 86bcb46cf..233b3aab5 100644
--- a/tools/harness-thci/OpenThread.py
+++ b/tools/harness-thci/OpenThread.py
@@ -1364,6 +1364,9 @@ class OpenThreadTHCI(object):
         self.log('factoryreset finished within 10s timeout.')
         self._deviceAfterReset()
 
+        if self.IsBorderRouter:
+            self.__executeCommand('log level 5')
+
     @API
     def removeRouter(self, xRouterId):
         """kickoff router with a given router id from the Thread Network