User's Manual Part 3

PERFORMING DOWNLOADS
Omni 3600 Download Differences
74 OMNI 3600 REFERENCE MANUAL
menu option. In a partial OS download operation, application files stored in
Group 1 are not erased.
• When you initiate the OS download, the OS file authentication progress
displays on the screen as new certificates are authenticated and added to the
terminal’s certificate tree, and as signature files for corresponding OS files are
detected and authenticated, as shown in Figure 30, page 71.
• While the new OS is being processed, there is no visible indication on the
terminal display of progress. When the new OS is processed (this usually
takes a few minutes), the terminal restarts automatically and the OS download
procedure is complete.
File Authentication for Back-to-Back Application Downloads
When performing a back-to-back application download between two docked
Omni 3600 terminals, the file authentication process on the receiving terminal is
similar to an application download from a host computer to a standalone
Omni 3600 terminal. There are, however, some important differences to take into
account:
• Only a full application download is supported for back-to-back data transfers.
You cannot perform partial back-to-back application downloads.
• Before you can initiate the back-to-back download, you must enter system
mode in both terminals, select Group 1 as the target group for both terminals,
and enter all required passwords.
• All signature files required to authenticate the download application(s) must
reside in memory of the sending terminal. They must not be deleted through
the *FA variable being cleared to 0 on previous downloads.
• Any sponsor and signer certificates downloaded to and authenticated on the
sending terminal are stored in the certificate tree of that terminal. When you
perform a back-to-back download, certificate files are reconstructed from the
data present in the sending unit’s certificate tree.
• All certificates transfer to Group 1 RAM on the receiving terminal, except for
the highest-level platform root certificate, which can never be transferred to
another terminal.
• When certificates are detected by the file authentication module of the
receiving terminal, they are processed exactly the same as in a direct
download: All certificates are checked one by one and, on authentication, are
added to the certificate tree of the receiving terminal. Then, all signature files
are checked.
CAUTION
If the power supply to the receiving terminal is accidentally cycled during an
operating system download procedure, the terminal may permanently lock up. In
that case, return the terminal to VeriFone for service.