diff --git a/src/runProc.cpp b/src/runProc.cpp
index 137e7e5..f89049c 100644
--- a/src/runProc.cpp
+++ b/src/runProc.cpp
@@ -641,8 +641,11 @@ void T_runProc::bl_rebootDC(void)
     // BL is working for 5s after power-on-reset.
 
     uint8_t len, buf[20];
+    memset(buf, 0x00, sizeof(buf));
 
     len=dcBL_restartDC(buf);
+
+    qCritical() << __func__ << QByteArray((const char *)buf, len).toHex(':');
     sendWRcmd_setSendBlock160(len, buf);
 }
 
@@ -652,8 +655,13 @@ void T_runProc::bl_startBL(void)
     // otherwise the BL jumps to normal DC application
     uint8_t len, buf[20];
 
+    memset(buf, 0x00, sizeof(buf));
+
     len=dcBL_activatBootloader(buf);
+
+    qCritical() << __func__ << QByteArray((const char *)buf, len).toHex(':');
     sendWRcmd_setSendBlock160(len, buf);
+
     epi_setNowIsBootload(true);
 }
 
@@ -661,8 +669,11 @@ void T_runProc::bl_checkBL(void)
 {
     // call this function in order to get information, afterwards use "bl_isUp()"
     uint8_t len, buf[20];
+    memset(buf, 0x00, sizeof(buf));
 
     len=dcBL_readFWversion(buf);
+
+    qCritical() << __func__ << QByteArray((const char *)buf, len).toHex(':');
     sendWRcmd_setSendBlock160(len, buf);
 }