checksum M2.1 mercedes

[esse]

Hi,
need help to calculate checksum in mode file pls

mercedes SLK 1996
Bosch M2.1
Thanks

[PcmTuner]

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https://www.digital-kaos.co.uk/forums/image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAQAAAA ngNWGAAAA/0lEQVR4AYXNMSiEcRyA4cfmGHQbCZIipkuxnJgMStlMNmeyD2d wmc8 sZgxYJd9ErIZFHUyYYD7fkr6l4/rnvmtl7 KitrqV/fq2Y5eLY3Z9S48eRLe7BmVZ9qhTLhQ0algzZWQOVKSsCF8OjAn wbxDTWFDUhPK/jMr1H6HE/IqRky2DyvCefuwItwZzodVoYRiLqMkVCXrwpJ9twZ sgfDYEFYl8wIWxZ9uFf7zkallxlJh4YrLGsKjZRx7VGHhLqwgF UN45DGdb8MeXGpgB4ABZdeDcpZEY51A hyLKz4S1W4MQWm3AibWtgWmk6dyISa1pSdyWTOlLXVp0 eL9D/ZPfBTNanAAAAAElFTkSuQmCC