Can't find legacy firmware versions

I updated my Classic XT to version 1.02 only to find that it sucks as the XT pots behave now in a steppy way. The old firmware (I think it was 0.98) was working fine and now I want to revert back to older version. The problem is that I can’t find them anyhere. Could someone tell where to load 0.98 .syx? Thanks!