Compare the re-registration form you printed AFTER THE RESET
with the details in TOPAZ.
Click on SETUP.
Choose COMPANY DETAILS.
Check if Telephone Number matches the registration form (spaces, brackets...)
Remember to click on the tick to save Company Details.
Click on PROPERTIES.
Choose LICENSE.
Check if SERIAL number matches the registration form serial number.
If this is correct TOPAZ will accept the serial number.
Remember to click on the tick at the bottom of the screen to save the details.
If this does not work do a reset serial and re-registration.
Read : How do I re-register Topaz
Print the registration form, sign it and fax it to Datatex.
If reset serial does not work,
Read : Reset serial does not change serial number.