?> **Notice** Your SD Card will need to be formatted as FAT32. If your SD Card is not formatted to FAT32, use [GUIFormat](http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm) with 32k (32768) Allocation unit size to format it.
In case anything goes wrong in the later process and your vWii ends up bricked, restoring a previously made NAND backup can fix it.
1. Launch the [Homebrew Launcher](vwii/browser-exploit).
1. Launch the `Wii U NAND Dumper` application.
1. Use the Wii U Gamepad's DPAD to enter the following configuration:
- Dump SLC: **optional**
- Dump SLCCMPT: **yes**
- Dump MLC: **optional**
- Dump OTP: **yes**
- Dump SEEPROM: **optional**
1. Press the A button to start the dumping process.
1. When the process completed, power off your Wii U, take your SD Card out of the Wii U and plug it into your PC.
1. To make sure you don't lose the files, copy the `slccmpt.bin`, `otp.bin` and if you chose to go with a full backup, `seeprom.bin`, `slc.bin`, and `every mlc.bin.part` file to your computer.
1. Delete the files from your SD Card to free up space.
1. Take the SD Card out of your computer and plug it into your Wii U console.
!> If for any reason, the Wii U is turned off while patching IOS 80, your vWii will be bricked. This can be fixed by either extracting the IOS 80 from your previously made NAND backup and then replacing it over FTP or by [reinstalling IOS 80](recover-vwii-ioses-channels).
!> Installing custom System Menu is a definite brick risk and you should always have an effective backup before installing one but when done right, won't brick the vWii.