If your Brother printer is not recognizing our LC105 / LC107 ink cartridges, please request a replacement with our LC101 / LC103. We have found that a small percentage (1-2%) of Brother printers have a firmware update that may cause them to not accept the LC105 / LC107 - if that happens, please request a replacement of our LC 101 / LC 103 which we have not heard of any issues with.