In reply to:

Beta7 had this problem, in that one could not upgrade from beta3 due to "missing pump". I had to back out to 1.03 first, and then apply the beta7 upgrade.

I upgraded beta3 to beta7 and beta7 to beta11 without problems; I guess some other factor may also be involved.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)