Recommended Upgrade to My Cloud OS 5

WDC Tracking Number: WDC-21004
Published: March 12, 2021

Last Updated:  March 12, 2021


My Cloud OS 5 is a major and fundamental security release that provides an architectural revamp of our older My Cloud firmware and adds new defenses to thwart common classes of attacks. We recommend that all users upgrade to My Cloud OS 5 as soon as possible to benefit from the latest security fixes. My Cloud OS3 will not receive these security fixes.

Steps to upgrade to My Cloud OS 5 can be found here:

The following devices are eligible for upgrade to My Cloud OS 5.

My Cloud OS 5 Supported Devices
My Cloud EX2 Ultra
My Cloud EX4100
My Cloud PR2100
My Cloud PR4100
My Cloud DL2100
My Cloud DL4100
My Cloud EX2100
My Cloud (Firmware
My Cloud Mirror Gen 2

We will not provide any further security updates to the My Cloud OS3 firmware. We strongly encourage moving to the My Cloud OS5 firmware. If your device is not eligible for upgrade to My Cloud OS 5, we recommend that you upgrade to one of our other My Cloud offerings that support My Cloud OS 5. More information can be found here:

Western Digital is aware of third parties offering security patches for My Cloud OS3. We have not evaluated any such patches and we are unable to provide any support for such patches.