Please ensure the orange protection shield and any orange shipping locks are removed. Here's how they look
For some models, we produce universal and dedicated versions. The structure will have small difference from an original, it may have some interference during installation or may appear loose but once the printer engages the cartridge it will seat as necessary. Please follow the installation instruction for the cartridge and retry if your are having problem.
For Brother toner cartridges, there is a technical reset gear on one side. Although rare it is possible for the position of this reset gear to be accidentally changed which causes a failed installation. In such cases a replacement cartridge should be installed.