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dd is a tool that allows you to directly writing/reading a device at block level. dd = device dump.To use dd, first get the device path of your flash drive. You can do so by open gparted and it will list all drives. Select your flash drive, and you should see a path like /dev/sdx, where x is a letter.You should always double check it as if you F up, you can nuke your main hard drive. You can check it by using "sudo fdisk -l" to see if it's properly mounted to a removable media mounting path, such as /Media.Then, use "sudo dd if=xxx of=/dev/sdx bs=1m; sync" to nuke everything on your flash drive and substitute with the new iso.xxx is the full path of your ISO file. Quote it with quotation marks if it contains spaces. /dev/sdx is the device path of your flash drive.Then pray that you did dd to the correct device. You will find EVERYTHING is nuked if you dd to the wrong place, so please check it very carefully.After a long time (after all, you're writing 3.x GB to a flash drive), the command should finish and you should see the command prompt again. Eject your flash drive and you are good to go.
I just used woeusb today to make a Windows 10 USB 4GB boot disk.https://github.com/slacka/WoeUSB