Printronix SL4M - Manual (Page 163)

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16. Once logged in, type the following sequence at the command prompt to
download the filename .prg file to the printer:
cd dest <Enter>
cd d1prn <Enter>
bin <Enter>
put filename.prg <Enter>
where filename .prg is the file name you noted in step 8.
IMPORTANT Do not interrupt the downloading process once it has started.
Interrupting a download will leave the flash memory on the controller
PCBA and NIC incompletely loaded, and the printer may not boot up.
17. When the download is complete, exit the FTP program by typing:
quit <Enter>
18. When the new software has successfully loaded into flash memory and
the printer has reset itself, set the printer power switch to O (Off).
19. Remove the CD from the host computer and store it with the printer.
20. If required, reconnect the data input cable(s) to the printer.
21. Set the printer power switch to | (On).
22. Using the configuration printout(s) you made in step 1 on page 162,
restore the printer configurations.