It's a bit like formatting a computer's hard drive. To reflash the Yún from the U-Boot prompt, you will download 3 different image files and write their contents on the flash memory of the Yún, erasing all previously stored information. With U-Boot you can restore a Yún to its factory settings. U-Boot is a very small program executed right after you power on a Yún. This procedure uses U-Boot, something similar to the BIOS on a PC. Changing the default configuration and installing packages that take up too much space may cause the installation to become unstable. Typically, this is because there is something wrong with the existing Linux installation. There are situations in which the recommended upgrade procedure does not or cannot work.
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