Many years ago, we upgraded our A2000HD from 1.3 to 3.1, bypassing 2.x entirely. If I recall correctly, the only program we had problems with was the Music program from our Amiga Appetizer package from Gold Disk Inc. For some reason, it played music too fast after the upgrade. Never got that one sorted out. There might also have been some problems with speech synthesis. The A2000HD is currently down for repairs. We never had an accelerator card, so the machine was running on the 68000 CPU for its entire life.
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redfox