From here, you can type the same commands described in the TIL article regarding using AppleWorks. Close the Terminal window when done. Quit Remote Access. Reselect the previous modem script from the Modem control panel. You are done.
Many telephone lines carry a very low voltage.
If the voltage is extremely low, the Updater may work but the firmware may get corrupted in the process. If the voltage is just very low, the modem will not be quiet, and the installer will say that the modem is not responding properly. We continue to get scattered reports of the Modem Updater 2.0 failing to install, leaving you with a modem that does not work at all. This seems more common with PowerBooks than with other Macs. One reader found this happened after using the Mac OS Restore disk to restore his system software.