Kudos to Zooz support. After I contacted them, they made the .gbl file accessible via http link to use with the [BETA] Updated binary firmware updater. Note this is not the built-in Z-Wave Firmware Updater (which cannot be used with pre-C7 to update the ZSE42]. I've not yet been successful at upgrading ZSE42s this way (sticks at "Wake up your sleepy device"), but I haven't spent much time on it either.
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