SamyGO

You can't

Link works currently, don't think it ever stopped to

The frame is quite exotic model and looks to remain "L series" every year so far. You may find correct letter (where I moved your post) after second number though, like all other Q's. Otherwise you can simply trust launch year

TV just won't accept firmware with different name. No upgrade, no brick

A usual PC is powerful enough to default to sw when no hw support. TV not.
Your TV series is where you posted

Nope, no root for you (yet, or at all).
"Codec" is usually a hardware capability on powerless SoCs, so there's never a chance to "add" one anyway.

Both same, just typo (T-NT14MJ doesn't exist actually...)

Nope.

No. It's stuff that MUST be run on rooted TV.

Impero wrote: ↑Wed May 25, 2022 11:19 am Is there any reason why the Tools menu became inaccessible with the latest version of the decoder?

Because developers like to introduce bugs. Better is enemy of good, grandma said