HP Color Laserjet Enterprise CM4540 MFP - Error Code 49.38.07

[Quicksilver]

I have the above error code which I understand relates to firmware. I've followed instructions from other posts, which suggests removing the network cable & then re-powering the machine when the machine should come to ready, then clear the print jobs & upgrade firmware. The problem I have, is that whatever I do, I can't clear the error code. If it's relative, on powering up, the machine goes through its self diagnostic processes & fails between numbers 5/6 when checking hardware, which is right at the end of the process

[dalewb74]

have you removed all the extra cables that are plugged into the machine? then unplug the power and release residual power. it is not plugged into a battery backup or surge protector? if so, remove the power cord and plug directly into the wall. maybe this will help.

[Quicksilver]

There's no extra cables, just the network cable & I have removed the mains cable direct from the wall socket too.

[tmw]

Try the pre boot menu to update firmware using a USB. Turn on the machine and press the HP logo when it says 1/8. Should bring up the menu. Scroll to the appropriate entry. If it still is making problems, it may need formatter or hard drive.

[Quicksilver]

Thanks tmw, I did find this procedure prior to your post & can confirm this was the way into admin menu which then allowed me to update the firmware. This did overcome the original problem. Thanks once again