Issue solved after replacing the "SD Card".
Here is an article to help when the device is showing in the Non Customer Mode.
Hello I have a Xerox WC 7855. Unfortunately from last 7 days the Machine Keep rebooting saying "Network Controller Error". I tried to check the log for the few second machine stay on the home screen and found a lot of 303.331.00 Errors. Here are a few thing I tried.
1. I installed the most recent firmware (073.010.075.34540) using 'altboot' with FORCED_UPGRADE. it doesn't help.
2. Then I try to downgrade my firmware to (072.010.004.09100) Still No Solution. (I also used DISABLE_DATA_BACKUP)
3. I changed my HDD...still No help.
4. Borrowed a Completely working 7855 Mainboard from a Friend still the same issue.
(Please note that I cant go in admin/service mode cause its reboots automatically after 5-6 seconds)
Solved! Go to Solution.