unless you have confirmation it is unbranded (rare). Cross-flashing can:
: Specialized repositories like Original Products Firmware provide links to original software and updates for the A4201G. pirelli adb prg a4201g firmware link
If you are looking for the official firmware, it is highly recommended to check the support or download section of your specific ISP's website, as they often provide custom firmware tailored to their network configurations. General Firmware Update Process unless you have confirmation it is unbranded (rare)