Firmware backup: "cp: cannot create regular file -> read-only filesystem" #483

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1. queermeet-dev

   changed the title [-]"cp: cannot create regular file -> read-only filesystem"[/-] [+]Firmware backup: "cp: cannot create regular file -> read-only filesystem"[/+] on Jun 30, 2025
2. MrChromebox commented on Jun 30, 2025

   

   MrChromebox

   on Jun 30, 2025

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   well, it's because the first partition on your USB is being mounted read only, not much the script can do about that.

   Acer Chromebook 315 CB315-3H-C0EV

   as I stress repeatedly in the documentation, this is meaningless/useless to me. ChromeOS board name as reported by the script is all that matters.
3. mainbrain commented on Oct 4, 2025

   

   mainbrain

   on Oct 4, 2025

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   I had the same problem and found a work around. Although I wasn't able to find out why the device was mounted in read only mode. I was able to fix my problem by manually mounting the usb drive to /tmp/mydrive before starting firmware-util.sh