Knowledgebase: Support > VCM Editor
Reader Upload Request :x7F Negative response code error
If you receive the "Reader Upload Request :x7F Negative response code" error, this indicates your vehicle has likely been previously tuned and the ability to read the tune has been disabled. 

Please send the following to support for further assistance:

1) VCM Suite Infolog while connected to the vehicle as shown here:
2) Debug.dat file from your PC. This is located in ...Documents/ HP Tuners/ Settings
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