The primary appeal of this firmware is economic. Official cartridges are often priced nearly as high as the printer itself—a business model known as the "razor and blades" strategy. By applying this fix, users can:

This is the #1 cause. If you attempted to update the ML-1660’s firmware via Samsung’s outdated "Firmware Download Utility" and the process was interrupted (power outage, USB cable yanked, computer crash), the printer is left with a half-written, corrupted .fls file.

To fix the ML1660 V1.01.00.30.fls file, follow these steps: