Can I downgrade my TV safely?

[gioggiocod]

I have a 40 inches H6670 Smart TV upgraded to the latest firmware on the Samsung website, that is, T-MST14DEUC v2890.2. The auto update in the Smart TV said the v2880 was the latest firmware before upgrading via USB.
I noticed that the guide here for downgrading is from three years ago and the v2890 update is from last year, so I was wondering if I can still downgrade down to v0000 for rooting it or it would brick.

[juusso]

If your tv accepts 0000 firmware, then it should downgrade. If not, then means you are to late.

[gioggiocod]

Thanks but how can I be sure that my tv accepts it?
Is it safe to try to downgrade then?

[juusso]

If it starts software upgrade procedure with your given firmware, then means it accepts it. If it says no software upgrade found then means it does not accept it

[gioggiocod]

Thanks for the reply, I tried downgrading and it did, so I can confirm that downgrading a H6670 to T-MST14DEUC v0000 works perfectly fine.
Now that I successfully downgraded I should re-upgrade to a firmware version T-MST14DEUC <= v2130, right? So can I install v2130 now?