no you can not use it, why don’t u just save your blobs and try out the tethered 5.2.1 if you aren’t planning on moving it from tv to tv you will never notice it being tethered.
If you don’t like it you have the blobs saved so u can go back
Maybe ill try that if I can get my blobs out of it using ifaith,
Because yesterday I tried several times to get the blobs using ifaith but for some reason it gives me a message ; firmeware not supported;; so I wonder if I need an older version of ifaith
For sure you can JB it with untethered. Try to save ifaith with Ifaith v1.4.2 or 1.5.5 and 1.5.6 may be you change to another computer to do that, I just JB one today with firmware 4.1.1 and IOS 4.2.1, First time i try with Ifaith 1.5.5 and can get a error Not detected IOS something, and next I tried to Save with Ifaith v1.4.2 is worked. And I use SnOwbreeze + Itunes to JB and now i have ATV 2nd version 4.1.1 Untethered.