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You shouldn't mislead him Annelies, maybe you only read the topic, and not his question.
Also, the banner you were referred to, contains false information, it is possible to downgrade 4.00.

And the answer is quite simple;

Step 1) Buy a Progskeet and downgrade to firmware < 3.56.
Step 2) Install Kmeaw 3.55 firmware.

And you're done.