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Modified firmware for Canon EOS 300D/Digital Rebel

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My friend Victor Lushnikov has developed and has mass-produced very useful device for normal work of system of an auto focus on cameras Canon EOS at use of not autofocal lens.

More in detail on page Adapter for MF lens

On this website you can find the latest information about modified firmware for Canon EOS 300D/Digital Rebel camera. All information is provided by the author himself.

Reasons for modifying original cameras firmware

6.3 megapixel EOS 300D/Digital Rebel is based on the same CMOS sensor and DIGIC microprocessor as EOS 10D, more expensive digital SLR from Canon. Similarities between those two models suggested that most likely EOS 300D/Digital Rebel uses the same code base as EOS 10D with some functionality disabled at software (firmware) level. After close firmware analysis, by changing only two bytes, Custom Functions menu, identical with EOS 10D, but disabled on EOS 300D/Digital Rebel, was successfully revealed. Since EOS 300D/Digital Rebels firmware lack of certain subroutines, not all functions available in this menu are working on EOS 300D/Digital Rebel. Nevertheless, as for today, modified firmware provides EOS 300D/Digital Rebel owners with following additional functionality:

  • Enter Flash Exposure Compensation using SET button
  • SET button function when shooting
  • Shutter release w/o CF card
  • Flash sync speed in Av mode
  • RAW+JPEG rec. Sets the quality of embedded JPEG
  • Mirror Lock up
  • Selects the autofocus mode: AIfocusAF, ONEShot
  • ISO 3200

    The firmware decryptor developed by Alex Bernstein (http://www.alexbernstein.com/wiki/HomePage) was used while working on this project

    Here you can download latest version of modified firmware for Canon EOS 300D/Digital Rebel.


    Modified firmware is distributed absolutely free on an as is and as available basis without warranties or conditions of any kind. We are not responsible or liable, directly or indirectly, for any damage or loss caused by usage of this firmware. Use it on your own risk. However, we making every effort and thoroughly testing new versions of the firmware, before making them available for download. Since we cannot guarantee integrity and quality of the modified firmware downloaded from different web sites, we strongly encourage you to use firmware downloaded from this site only.

    Attention! Do not use this firmware with any other cameras but Canon EOS 300D/Digital Rebel/KISS Digital only.

    Thank you for stopping by and showing interest in this project.

    Please send comments and feedback to satinfo@narod.ru

    Sincerely Ravil and Wasia

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