I discovered today that if you upgrade a network containing a single MS220-8p that was on MS 15.21.1, that then became MS 15.21.1/CS 15.21.1 with the firmware split, the ghost CS entry gets left at 15.21.1 with no way to upgrade or remove it... 🤔
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As you would expect the only options for the network upgrades are the MS tree.
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