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Verification… OK.

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He ran (mesh bed leveling). The probe (a simple BLTouch he also installed) tapped 25 points across the bed. The LCD displayed a mesh—a gentle hill in the center. Verification… OK

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He clicked . The lights flickered. The console scrolled:

The LCD flickered, went blank for 3 seconds—an eternity—then rebooted.

Using (or avrdude via command line), he connected to the S8 via USB. Selected: Marlin.hex . Clicked "Flash" .