Most flash upgrades for the internal 56 data/fax accura modem (hayes) make the modem lock. Both the flex and v90 versions here work, unlike the newer ones which never work. IMPORTANT-> you must use the pins on the modem to force the COM (1-4), and install a generic 56 driver to that COM port. afterwards, you may remove the pins and allow the plug 'n play to configure the modem.
If you have any problems, contact me. firstname.lastname@example.org
The following files are found inside the driver download file.