Hello,
Lexmark x950de error 121.06
I replaced fuser unit.
I ran Error Code board menu by pressing 3+4+6 during power on.
I connect notebook to copymachine by USB cable to install print driver.
I used usbutila and pjl file to reset error (drag and drop pjl file on usbutila by mouse), but nothing happened.
Details:
Finally I tried two notebooks first one with W7 64bit Pro and second one W10 64bit Pro.
On W7 usbutila openned command window with flashing cursor and it was not possible any interaction by keyboard or mouse.
On W10 usbutila openned command window only for 1s.
In both cases nothing happened.

During installation driver on W7 I had to resolve several problems to install it. Ok, so that I tried notebook with W10.
On W10 notebook the installation of drivers finished without any problems (I also checked it in Windows system HW manager). On this notebbok I tried two drivers, first one automatically installed by Windows system and second one Postcript driver downloaded from Lexmark.

Please will you help me, what is the problem ? I am frustrated from this stupid conditions.
Thank you.