Just updated the firmware on my PR4100. Now most of the apps are gone from the app store?
Yes, some apps for OS3 not available for OS5
I have OS5 5.26.300, not OS3.
Manually update the firmware to 5.27.157, then the app store will be updated and all missing apps will reappear.
The latest firmware update changed the base Linux distribution from Debian 10 (Buster) to Debian 11 (Bullseye). Therefore, most apps for My Cloud OS5 firmware version 5.27.157 (and newer) are NOT compatible with prior firmware versions, and vice versa.
Thanks @Cerberus it worked great.