The gpmodem.zip file on Google Drive contains drivers and software for legacy Grameenphone (GP) USB modems, allowing users to manage 3G/4G connectivity, SMS, and storage . Users must download and extract the archive, run the installer, and optionally configure the modem via the APN 'gpinternet' to establish a connection . For the official device page, visit Grameenphone . Hardware Installation - ZTE Devices