gorib65
What message do you get when you try to use it?
Have you also tried searching
http://www.s1fw.com/ for other "ATJ2091N" firmware to see if they work?
Also try downloading the firmware from our site as well.
Look at the [Downloads] section on the left hand side, then click on [Firmware].
Try those and see how you go.
Unfortunately it's a lot of trial and error until you find one that is compatible.