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You should reboot the machine with the boot media and verify that you are able to boot with it before continuing.
You must use the [option]`--force` option if you want [command]#dracut# to overwrite an existing `initramfs` (for example, if your `initramfs` has become corrupt). Otherwise [command]#dracut# will refuse to overwrite the existing `initramfs` file:
You must have a copy of the `boot.iso` file from a {MAJOROS} installation DVD, or installation CD-ROM#1, and you need a USB storage device formatted with the `VFAT` file system and around 16 MB of free space. The following procedure will not affect existing files on the USB storage device unless they have the same path names as the files that you copy onto it. To create USB boot media, perform the following commands as the `root` user:
You can transfer a distribution image file or a minimal boot media image file to USB media. Make sure that sufficient free space is available on the device. Around 4 GB is required for a distribution DVD image, around 700 MB for a distribution CD image, or around 10 MB for a minimal boot media image.
You can create an initramfs in the current directory by calling [command]#dracut _initramfs_name_ _kernel_version_pass:attributes[{blank}]#, for example:
xref:Manually_Upgrading_the_Kernel.adoc#ex-Ensuring_that_the_kernel_and_initramfs_versions_match[Ensuring that the kernel and initramfs versions match] shows that:
...where _sdX_ is the device name.
Whenever possible, use either the [application]*DNF* or [application]*PackageKit* package manager to install a new kernel because they always *install* a new kernel instead of replacing the current one, which could potentially leave your system unable to boot.
we have three kernels installed (or, more correctly, three kernel files are present in the `/boot/` directory),
Via Fedora Update System — Download and install the kernel RPM packages. For more information, refer to link:++http://bodhi.fedoraproject.org/++[].
Via `_DNF_` using check-update:
Verifying the Initial RAM Disk Image and Kernel on IBM eServer System i
Verifying the Initial RAM Disk Image
Verifying the Boot Loader
Use the `isolinux.cfg` file from `boot.iso` as the `syslinux.cfg` file for the USB device:
Use DNF to install kernels whenever possible
USB media often comes in the form of flash devices sometimes called _pen drives_, _thumb disks_, or _keys_, or as an externally-connected hard disk device. Almost all media of this type is formatted as a `VFAT` file system. You can create bootable USB media on media formatted as `ext2`, `ext3`, `ext4`, or `VFAT`.
Unmount `boot.iso` and the USB storage device:
To install the kernel manually, continue to xref:Manually_Upgrading_the_Kernel.adoc#s1-kernel-perform-upgrade[Performing the Upgrade].
To determine which kernel packages are installed, execute the command [command]#dnf list installed "kernel-*"# at a shell prompt. The output will comprise some or all of the following packages, depending on the system's architecture, and the version numbers might differ: