C5100 help (samba sharing)

[juusso]

So, I'd like to enable virtual USB to read Samba sharing.
I've read the wiki pages, but I didn't find a solution

Are you sure? Use hotel mode hack and you get samba/nfs mounted, Or you can use samygo all extensions after you root TV too.

1. The firmware version is T-MSX5DEUC 2009.0, is it possible to hack it to make the changes I want do?

See above.

2. If yes, which is which is the easiest (and safest) way to hack it?

You have only one way - hack over hotel mode, witch is not very safe...

so I think hacking over Hotel Mode is the only way, right?

Absolutely.

3. ...is it possible to downgrade the firmware?

just after you root your TV,

[juusso]

Have you dowbgrade the firmware?
If not, take it easy, the wiki T-VALDEUC only. To make the same process on your TV, you need to write right ID of your previous firmwares (eg from T-MSX5DEUC 1012).