I have a rough souvenir of having installed "the last of the last" TOS version on my F2-221. Now (and it's too late) I think I remember this "last of the last" TOS installation was blocking future updates (and worse future apps installation).
Very stupidly, I have uninstalled (a too rapid manipulation) my Plex server and it is now impossible to reinstall it (even manually).
So, how can I re-install an older TOS in a more flexible version, or how can I upgrade TOS to a TOS5 version, more flexible?
Note: I need a brutal solution (since nothing of all my tests work).
Without my Plex server running, I am very sad

