|I've had some luck with the following:|
Open up a command prompt. Type "diskpart" and press enter. At the "DISKPART >" prompt, type "list volume". This will show you a list of your drives and a corresponding number. Assuming your flash drive is listed as "5", type "select volume 5". Then type "attributes volume clear readonly" and press enter.
That will remove the "readonly" setting from the flash drive's volume. Hopefully it helps.
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