The culprit: had overwritten Epson’s specific driver. The generic driver worked, but poorly – it couldn’t control the EcoTank’s unique color mixing properly.
To ensure security and stability, drivers should always be downloaded from official sources. Avoid third-party "driver updater" tools, as these often bundle unwanted software or provide outdated files.
AirPrint worked for basic printing, but:
One user named Rita downloaded it anyway, ran the installer in , and the ET-2850 printed flawlessly on her old Windows 7 PC.