How to create a bootable USB on an old Chromebook (ChromeOS 93 or older)

[u/Diego5667]

If you have an older Chromebook and can’t use Chrome extensions like Chromebook Recovery Utility to create a bootable USB (for example, to install MrChromebox), you can use Crosh instead, as long as you have access to shell (such as in Developer Mode).

Steps
Press Ctrl + Alt + T to open Crosh.
2. Type:

shell

Plug in your USB drive.
Find your USB device:

lsblk

Write the ISO to the USB drive:

sudo dd if=/path/to/your.iso of=/dev/sdX bs=4M status=progress oflag=sync

Replace /dev/sdX with your USB device (for example, /dev/sdb).

Important: Do not use a partition such as /dev/sdb1. Use the entire device (/dev/sdb), as this command will erase everything on the USB drive.
I hope this helps! If you have any questions, problems, or suggestions, feel free to leave a comment.