Does the volume automount, i.e. you just plug it in and a disk appears? If not, what do you have to do, e.g. "hold button BOOTSEL while inserting"
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What's the USB VID and PID for the device you insert? You can see this using "lsusb" e.g. 090c:1000
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What's the IdLabel for the mounted volume? You can see this using "udisksctl info -b /dev/sdaXXX" where XXX is the new block number
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What's the IdType for the mounted volume? You can see this using the same "udisksctl info -b /dev/sdaXXX"
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What's the IdUUID for the mounted volume? You can see this using the same "udisksctl info -b /dev/sdaXXX"
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What's the UUID for the mounted PARTITION? You can see this using "udisksctl info -b /dev/sdaXXX"
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Does the mounted volume show the old firmware binary?
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Does the old firmware binary have a predictable name? e.g. FIRMWARE.BIN If so, what is it?
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Does the volume have an extra file with information about the current firmware? e.g. MANIFEST.JSON -- If so, what is it? If you've got a link to a real world example that's even better!
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Can you provide a link to some example firmware for this device?
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Many thanks for helping me! Can you provide your email address so that I might be able to contact you for any follow-up questions?