(Never flash on battery). Is the file exactly the same size as the original? Are Visual C++ Redistributables installed? Is the car battery supported by a charger?
If you are working with a KESS V2 master or clone tool and encounter the dreaded during the writing process, you know how stressful it can be. This error typically occurs right after you select the file to write to the ECU, preventing the tool from proceeding and leaving your vehicle in a non-operational state. checksum error writing buffer kess v2 verified
Always connect a stable battery charger (or a second vehicle via jumper cables) to the car being flashed. (Never flash on battery)
Ensure your laptop is not connected to the internet if you are using a clone tool, as it may attempt to "call home" and lock the buffer. Summary Checklist Is the car battery supported by a charger