Just follow the instructions and you will be satisfied. I looked at so many reviews and worried that an unfamiliar brand would be recognized; Guess IST! The bonus is that you get 2 DR-420 drums complete with instructions. Upset! PS I have attached a screenshot of 100% drum life after following their instructions. I also bought their toner and my favorite Brother MFC-7360N is like new and I have an EXTRA drum and 3 EXTRA toners all LESS than the price of the official Brother drum!
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