Go to Management -> Settings -> Backup and save your current configuration.
Unlike modern consumer brands like ASUS or TP-Link, Pirelli (now part of the ADB group) typically distributed firmware through rather than direct public downloads. pirelli adb prg a4201g firmware link
Protecting your network from older vulnerabilities that modern bots frequently target. Go to Management -> Settings -> Backup and
Select the file and click 'Update'. Do not turn off the power. The router will reboot automatically once finished. Troubleshooting the A4201G Select the file and click 'Update'
Enhanced support for different ADSL2+ standards and DSLAM configurations at the exchange. UI Performance: A more responsive web management interface. Finding the Firmware Link: A Word of Caution
Never update firmware over Wi-Fi. A signal drop during the write process will ruin the device. Upload: Go to Management -> Update Software .
Sites like OpenWrt or DSLReports often host legacy firmware files, but ensure the hardware version matches your device exactly to avoid "bricking" (making the router unusable). How to Check Your Current Firmware Version