Lexmark X543 Service Manual page 171

5.
Open the USBFlash utility. This window will display.
6.
Click the Browse Files button. The file browse dialog displays.
7.
In the file browse dialog, browse to the fullnet.fls (also called 1.fls) file. The fullnet.fls file is the RIP firmware
file.
Warning: It is critical that the RIP firmware gets updated first. Failure to do so, can render the printer
inoperable.
8.
Click Open. The file browse dialog will close.
7525-xxx
3-47
Diagnostic aids