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RE: Dell XPS 9550 CPU Multiplier Stuck at 8

For you I've got a workaround.

You need to shutdown the PC, then open the bottom lid up (unscrew 10 torx t5 screws and 2 philips ph1 under the XPS plate) and disconnect the battery for 10-15 seconds, then reconnect it back.

Other people in this thread discovered that you also need to hold the power button for 5-30 seconds while the battery is unplugged for the fix to work.

On my notebook it returned the speedstep back.

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