diff --git a/app/src/main/java/com/xypower/secapp/CertActivity.java b/app/src/main/java/com/xypower/secapp/CertActivity.java
index b90a3b7..c6293bb 100644
--- a/app/src/main/java/com/xypower/secapp/CertActivity.java
+++ b/app/src/main/java/com/xypower/secapp/CertActivity.java
@@ -53,7 +53,8 @@ public class CertActivity extends AppCompatActivity {
         res = dsSdk.mcuInit();
         res = dsSdk.mcuOpen();
 
-        boolean bres = dsSdk.mcuPowerOnCPR();
+        boolean bres = dsSdk.mcuPowerOffCPR();
+        bres = dsSdk.mcuPowerOnCPR();
         // String v = dsSdk.nrsecGetVersion();
 
         // res = dsSdk.nrsecInit();