The only guaranteed way to fix the "676 link" error and enable chip reset functionality is to to a version before the security update.
The printer's LEDs will flash during the update. Do not turn off the printer or unplug the cable until it automatically reboots (usually takes 1–2 minutes). Fix Firmware & Chip Reset for Samsung Printer
Leave a comment below with your exact firmware version and the error message you see. The community can provide specific file links (subject to forum rules). A small flathead screwdriver or a paperclip
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