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The A500 had official 3.1 ROMs. No idea where you can buy them.
I doubt there will be an official 3.1.4 ROM. There were no 3.5/3.9 official ROMs.
If you know someone with an EPROM burner they can be made easily. I paid about £100 for mine but I use it for other purposes, I'm sure there are cheaper options.
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