What is the correct boot system flash: statement need to be?
Remove the boot variable statement.
When the switch boots up, the system will search for the 1st available IOS from the directory (from top to bottom) and the search will "hit" the 12.2(55)SE11 BIN file and read that. If that file is corrupt, the system will then continue down the list until it hits the old IOS and read that.
What Leo describes, concerning how the device will search without a bootvar (assuming config reg correctly set) is correct, but do keep in mind it depends on the sequence of the files on the flash, i.e. accidentally changing the sequence may load an IOS version you didn't intend.
Also note, in this particular case, the one IOS bin is in a subdirectory and I don't recall the auto load feature searching subdirectories.
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