Studer SW V4.0 OnAir 1000 Operating And Service Instructions page 117

OnAir 1000 Digital Mixing Console
Then the new software is copied from the PC-Card into the console's Flash
EPROM. This will take several minutes.
Finally the last dialog box appears. The system can now be re-booted
(REBOOT) with the new software, or, if required and available, an op-
tional customer code (CCODE) can be entered.
Any customer code (see chapter 11.2.11) will be reset to the default value
(0x00000000) when updating the system software. This means that if your
system had a customer code before, you need to re-enter it in order to have
the particular features again.
After confirmation with ENTER, the following dialog box appears. Now,
you can either re-boot the system (REBOOT) or touch CCODE to change
the customer code:
SW Update 12-3
Date printed: 23.10.03 SW V 4.0