My Cloud OS 5 Firmware for My Cloud PR2100 and PR4100

My Cloud OS 3 Personal & Network Attached Storage My Cloud Pro Series
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My Cloud OS 5 is available for My Cloud PR2100 and PR4100.
Please refer to this post to learn how to update your device to My Cloud OS 5:

My Cloud OS 5: Firmware Availability and Supported Devices
My Cloud OS 5 How to Update From My Cloud OS 3

NEW! My Cloud OS 5 Limited Community Forum