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Your Service Tag may have shipped with Windows 8 or 7, and Dell removed Win10 recovery for that model. Use Method 2 (Microsoft Tool + Dell Driver Pack).
: Visit the Dell OS Recovery Tool page and download the version (x64 or ARM64) that matches the computer you are currently using.
If you are on the Dell PC that needs the ISO, the tool may auto-detect it. Otherwise, enter the Service Tag of the Dell computer you want to recover. Select the OS : Choose the Windows 10 image from the list. Prepare USB : Insert a USB drive (at least 16GB). All data on the USB will be erased.