WD My Cloud Is the firmware V04.05.00-342 the highest version?

Can this product only be upgraded to this version? Can firmware 2.41.116 not be upgraded? Can’t use OS5? Thanks for answering

No one cannot update the firmware on a first generation single bay My Cloud to use the v2.x or v5.x firmware used by the second generation single bay My Cloud. The second generation single bay My Cloud uses different hardware.

Firmware Release 04.05.00-342 (09/04/2019) is the current and latest firmware for the first gen single bay My Cloud.

The first gen single bay My Cloud status is: End of Updates.

WD Product Software Support Status
https://support-en.wd.com/app/answers/detail/a_id/28740