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On 19/08/2018 20:18, formantuk wrote:
You should be able to upgrade or downgrade to any OS - I don't remember any limitation here .
I'm pretty sure there was some deal with a different update method for different versions, i installed some of the 2.x firmwares. Didn't know 'mellotron' was left out, there was a particular reason why scramble had to go, depended on a memory management system that was upgraded so could no longer work. It was planned for reinstatement in a better form. andy