Some queries regarding My Cloud 3TB

I recently bought my cloud 3TB ver. with firmware v04.01.04-422 installed.
Should I upgrade to the latest firmware or downgrade to previous ones, as I need my NAS to be stable?
Also can I install transmission or other bt client on it?
What other info or mods to get the best performance?
If it crashes, are there 3TB images available to bring it back ?

A search of the forum using the search option (magnifying glass icon) yields answers to all your questions.

https://community.wd.com/t/firmware-worth-updating/149369

https://community.wd.com/t/app-transmission-v2-84-for-firmware-v4-12-2014/93424

https://community.wd.com/t/app-qbittorrent-various-versions-for-firmware-v4-01-2016/146729

https://community.wd.com/t/faq-twonky-dlna-media-server-setup-use/95373

https://community.wd.com/t/before-you-pack-up-your-wd-and-return-it-lets-talk-about-copying-speeds/91887

https://community.wd.com/t/guide-debrick-a-completely-dead-mycloud/92253

https://community.wd.com/t/guide-how-to-unbrick-your-2tb-3tb-4tb-my-cloud/93336