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MCU2 Upgrade

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For those of you that have actually gone through with the MCU2 upgrade on your S/X, are you allowed to keep the MCU1 hardware? Mine was replaced less than a year ago to get rid of yellow line and is relatively new. There's an ebay market out there for people out of warranty who need a new MCU and won't want the upgrade. I'd rather keep and sell the hardware if I'm shelling out $2500.