Zoom 2021 ISDN Firmware Update. Model 2021 latest international firmware update (.zip file) for the ISDN DUO. Once you selected the specific product update, the file may download to your machine. To complete the product upgrade you will need to download the file into the unit using Win ICM or MacICM depending on the OS your ISDN product is installed on..
DriverFinder is an advanced driver scanning, updating and downloading utility for Windows-based PCs. Individual drivers may be available by manually visiting device manufacturer websites.