The appearance of uupd.bin indicates that your SD card's controller has crashed and entered or an emergency factory state.
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👉 : Use SD card as storage for the final ISO or extracted USB files, not as the build workspace. For building directly, an internal SSD is always faster and more reliable. The appearance of uupd
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. Seeing this file on your card—especially if its storage capacity has suddenly shrunk (often to around 1.86GB)—typically means the card has failed and your data is at risk.