1) Consolenkabel dran
2) Stromkabel ab
3) Stromkabel wieder dran und gleichzeitig den MODE Button am Switch gedrück halten
4) Wenn der Switch> Prompt kommt schauen obs geklappt hat
So und jenachdem welches Model du hast hier die Action wie lange du die Mode Taste drücken musst
Catalyst Switch Series
LED Behavior and Mode Button Release Action
2900XL, 3500XL, 3550
Release the Mode button when the LED above Port1x goes out.
2940, 2950
Release the Mode button after approximately 5 seconds when the Status (STAT) LED goes out. When you release the Mode button, the SYST LED blinks amber.
2960, 2970
Release the Mode button when the SYST LED blinks amber and then turns solid green. When you release the Mode button, the SYST LED blinks green.
3560, 3750
Release the Mode button after approximately 15 seconds when the SYST LED turns solid green. When you release the Mode button, the SYST LED blinks green.