I need to load an IOS onto a 3850 due to a data corruption on the device. Can I just copy the IOS file onto a standard USB stick, or does it require some odd file format? Anything else I need to be aware of?
For anyone else out there having this issue: The drive needs to be formatted as FAT (a.k.a FAT16).
FAT can only be used on partitions of up to 4GB so if you have a flashdrive larger than that, you'll need to use diskpart (or your preferred partition software) to create a partition of max 4GB. Then you will be able to format that partition as FAT and the router will recognise it.
These are the diskpart commands on Windows. THIS WILL WIPE THE CONTENTS OF YOUR USB PENDRIVE:
diskpart list disk select disk <INDEX OF USB DISK> clean create part primary size=4000 active
Done! Now you can use Windows Explorer to format the drive as FAT.
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