The memory modules came well packed to after 2 days. The installation is quite easy. Only take power from the device, then open the small box at the left of the printer. Now you have to insert the bolt in the correct direction and push it backwards. If it snaps, everything is correct. But not the last door closed again and turn on the device. The first time the memory is checked. The printer will then count from 4MB to 544 high (512 by the bolt + 32 Intern). With me everything has just works beautifully the first time. I would highly recommend this Speicherriegel hesitation to anyone who needs a RAM expansion for Brother HL-3040CN his.