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Introduction
Use this guide to replace the Apple custom blade SSD (NVMe/PCIe x4).
This guide is intended for iMac Intel 21.5" EMC 2545 models that are equipped with an SSD (Fusion Drive or blade SSD configurations) or to add in.

'''If your system does not already have a new blade SSD installed you won’t be able to install it later as the connector and the support components are not present on the logic board.'''