You can install the downloaded firmware using a computer to "flash" the device: : Connect your iPad to your computer via USB.
: Another repository for downloading original ROMs and IPSW files. Installation Methods
Official firmware is hosted on Apple's servers, but third-party repositories provide organized direct links:
: Provides a comprehensive wizard to help select the correct firmware file for older devices.
: Software like 3uTools can automate the download and flashing process for legacy devices. Important Considerations