If the original software is missing or incompatible with newer Windows versions (like Windows 10 or 11), you can use third-party managers:
A robust tool for 3G/4G modems that allows you to check SIM balance and manage SMS.
Common file names for these programs include ModemApplication.exe or HSPA USB MODEM.exe .
This is the standard lightweight connection manager designed specifically for these devices.
📍 Svyaznoy as a retail brand primarily operated in Russia. If you are looking for specific regional firmware, ensure you are using a SIM card compatible with the modem's original locking settings (if any).