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What is fOS Basic?

fOS Basic is designed to be used on older or low powered systems, without the need for a patcher. fOS Basic can be obtained for free by entering the serial number of any fOS 10.4 system into the tool below, and, if successful, an image file will be downloaded onto your computer. No computer will be updated to fOS Basic from fOS 12 or earlier, and those without the power to update to fOS PC 10.15 Home will have to download it manually, following the link from fOS Update.