Comment 12 for bug 131672

The bug is explained here: https://bugs.launchpad.net/system76/+bug/114677

Download the following and follow instructions to BIOS update. Brightness keys should work well afterwards.

http://launchpadlibrarian.net/7835209/Sys76_BootImage
http://launchpadlibrarian.net/7835211/AFLASH2.EXE
http://launchpadlibrarian.net/7835215/Z35FAG.305

**Please backup any files on your USB pen drive that you want to keep. This process will completely reformat the drive.**

1. Download to your desktop the three files attached to this bug report (unfortunately, I can only seem to attach one per entry, so see the following entries for the other two). The attachments are: Sys76_BootImage , AFLASH2.EXE , Z35AG.305.

2. In a terminal, type: tail -f /var/log/syslog

3. Insert a USB pen drive

4. In the terminal, syslog will give you the /dev/* path of your USB pen drive. Record it. For a Darter, it will probably be /dev/sdb1. It is of the utmost importance that you record this path correctly. Failure to do so likely will hose your computer and reduce you to a slobbering cry-baby. (But don't worry. If you hose it, we're here for you.)

5. BEFORE YOU HIT ENTER, READ THIS ENTIRE STEP!
In a terminal, type:
dd if=~/Desktop/Sys76_BootImage of=/dev/sdb bs=1M
NOTICE that I omitted the number from the USB path (i.e. /dev/sdb instead of /dev/sdb1). ALSO, if you recorded something other than /dev/sdb in step #3, you should substitute your recorded path (minus the number) for /dev/sdb. In other words, type:
dd if=~/Desktop/Sys76_BootImage of=<your usb path minus the number> bs=1M

6. Right-click on the USB pen drive icon on your desktop and select EJECT.

7. Remove the USB pen drive from your computer and re-insert it. It should auto-mount and open a file browser showing you its contents.

8. Drag-and-drop AFLASH2.EXE and Z35FAG.305 into the file browser. Then close the file browser.

9. Right-click on the USB pen drive icon on your desktop and select EJECT.

10. Restart your computer. When the INTEL screen appears, press ESCAPE.

11. Using your arrow keys, highlight your USB pen drive and Press Enter.

12. When you get the A:\> prompt, type the following and press enter:
aflash2 z35fag

13. Type "2" (without the quotes) and press enter.

14. Type "z35fag.305" (without the quotes) and press enter.

15. Press "Y"

16. When the process has completed, press your spacebar. Remove the USB pen drive. Press Ctrl-Alt-Delete and let your computer reboot.

17. You will then see the American Megatrends screen, which will give you a "CMOS Checksum Bad" message. Don't sweat it. It's the last time you'll ever see it. Press F1 to continue booting.

18. Enjoy the use of your LCD brightness keys (Fn-F5 and Fn-F6).