Ran into something I have never had happen... 16188051 ecm (LT1) using flashhack, after reading the Eside had completed it post a fail due to eside check sum invalid (T side was ok). I have no idea on the history on the ECM, friend bought it off ebay. I was wondering if I flashed a known good bin file into ECM if this might fix it (if the write cal will work). Haven't tried anything yet. I tried my ECM (read fine) just to make sure the cable / PC did go honky on me.