diff --git a/main.cpp b/main.cpp
index 427c840..2a235e4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -74,6 +74,8 @@ void printBuffer()
 
 int calcChecksum()
 {
+    saveFile(filePath + ".bak");
+
     int sum = 0;
     for (int i = firstByte; i <= lastByte; i++)
     {
@@ -93,10 +95,10 @@ int main(int argc, char *argv[])
     int sum = calcChecksum();
     saveFile(filePath);
 
-    cout << hex;
-    cout << "0x" << checksum1 << ": 0x" << static_cast<unsigned>(buffer.at(checksum1)) << endl;
-    cout << "0x" << checksum2 << ": 0x" << static_cast<unsigned>(buffer.at(checksum2)) << endl;
-    cout << "checksum (0x" << firstByte << " .. 0x" << lastByte << "): 0x" << sum << endl;
+    //cout << hex;
+    //cout << "0x" << checksum1 << ": 0x" << static_cast<unsigned>(buffer.at(checksum1)) << endl;
+    //cout << "0x" << checksum2 << ": 0x" << static_cast<unsigned>(buffer.at(checksum2)) << endl;
+    //cout << "checksum (0x" << firstByte << " .. 0x" << lastByte << "): 0x" << sum << endl;
 
     return 0;
 }