Review on 🖨️ High-Yield Aztech Compatible Toner Cartridge Replacement for HP 201X CF400X 201A CF400A: Black, 2-Pack - Efficient Ink for HP Color Pro MFP M277dw M252dw M277n M277c6 M252n M277n Printer by Dan Chunn

The first set of cartridges worked very well. So I bought another set. The new set worked fine for a few days, and then the documents started to print sparsely with black vertical spots. I have cleaned the cartridges to no avail. The only thing that worked was replacing the cartridges with HP brands. The second set of AZtech cartridges wasn't worth the money.