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Messages - Fatcat305

Hello hello
new to the forum and community.
Running specs: Canon Mark 3_ Firm v. 1.3.3
Task: I need to downgrade to version 1.1.3 to run ML 1.1.3
Protocol: Not working. Firmware v 1.1.3 is downloaded into my SD card but when I try to upgrade it tells me version firmware older than the one installed in camera.
Question: How can I downgrade to v.1.1.3? I don't have the EOS cd, should I buy it?
Any help will be appreciated, thank you.