I needed to upgrade my 2 x MSFC2's to c6msfc2-dsv-mz.121-19.E1.bin from c6msfc2-is-mz.121-3a.E4.
I copied the new image to sup-slot0:, added the boot system variable and reset the MSFC's from CatOS - they booted the new image from sup-slot0: succesfully.
At this time, the Sup2's were running 6.3(1).
I then upgraded my CatOS to 7.6(1), and rebooted the switches. On both of the boxes, the MSFC booted the 'old' image which was still in bootflash instead of booting the new image from sup-slot0:
I thought this might be a timing issue as the new CatOS took some time to come on line, but even when I reset the MSFC's from CatOS, they still would not boot the sup-slot0: image.
Here's my boot system commands :-
boot system flash sup-slot0:c6msfc2-dsv-mz.121-19.E1.bin
boot system bootflash:c6msfc2-is-mz.121-3a.E4
Any ideas ?