In this post I will show you how to cleanup your device memory in ROS 7.1 RC2. this worked on any devices.
1- from the winbox go to the tools and select the bandwidth test.
2- insert 127.0.0.1 in test to section.
3- set Direction to both.
4- press the start button and wait 20 seconds
5- press stop and you see the memory has been cleared and you have more space.
notic: This will sometimes cause the router to reboot suddenly
maybe this trick is a bug in ROS 7.1 RC2