The WD My Cloud Version: Firmware Release 2.42.115 (1/18/2022) can be downloaded from the WD Support website:
https://downloads.wdc.com/nas/My_Cloud_GLCR_2.42.115.bin
The next oldest firmware Release 2.41.121 (11/17/2021):
https://downloads.wdc.com/nas/My_Cloud_GLCR_2.41.121.bin
Generally WD prevents users from downloading earlier versions of the single bay My Cloud firmware beyond the latest two versions. If one needs or wants older firmware versions that cannot be downloaded from WD then see the following link and drill down for the firmware for your My Cloud device:
https://wd.hides.su/wd/
For example for the second gen v2.x firmware My Cloud: https://wd.hides.su/wd/Cloud_gen2/frimware/
In order to install the OS5 v5.x firmware to one’s second gen single bay My Cloud, one generally needs to install the 2.41.121 or 2.42.115 firmware first then update to the OS5 firmware either through the My Cloud Dashboard or downloading and manually installing the v5.x firmware from the WD Support link above.
Upgrade My Cloud OS 3 Firmware to My Cloud OS 5
https://support-en.wd.com/app/answers/detailweb/a_id/29813/
