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Do an "AT &V" and an "AT &Z?" in the terminal program.  This will show 
the current active configuration settings on your modem.  Print out this 
display.  The information will prove to be handy should something go wrong, or 
should you decide to perform a hardware reset.

Install them!  Instructions are listed on page 15-16 and 15-17 of the ZyXEL
User's Manual (Revision 2.1).  [page 15-7 and 15-8 in the on-line version]
Ensure that each ROM is inserted in the corresponding labelled socket. 

Jussi Torhonen (jussi.torhonen@kone.com) talked to the local distributor who
suggested that a hardware reset is advisable at this point.  The hardware
reset procedure is listed on page 15-15 and 15-16 of the ZyXEL User's Manual
(Revision 2.1).  [page 15-7 in the on-line version]  The reset allows setup
of the memory area reserved for new extended S-registers.

The hardware reset will restore the factory default settings (but not the 
country code settings).  To terminate the continuous analog loop test (the 
final phase of the hardware reset) momentarily depress the DATA/VOICE button 
on E/E+ models or use the front panel on S/S+ models.

Barney Campbell (bkc@maths.grace.cri.nz) notes that because the modem's
default is set to a DTE speed of 38.4kbps unless the terminal is pre-set to 
that speed, the hardware test result will appear as garbage on the screen, 
because normally the DTE speed is detected by receiving an AT. However 
a test result is still "available" from the LEDs (U1496E/E+).

To restore the modem to the settings before the hardware reset, re-input the
results of the "AT &V" command.
 
Barney Campbell (bkc@maths.grace.cri.nz) notes that the stored phone numbers 
in the modem are also deleted in the hardware reset.  To restore the modem to
the settings before the hardware reset, re-input the results of the "AT &Z?"
command.