Guys, i need some help!

I still have 42.11... and my rootfs is showing 83% use (37.6M available)...why? I didn't use anything from extras-devel, just extras-testing and extras....plus they are all small apps..a few mb maximum... I still could update to 44-1 OTA..and then to 51-1...but i need to free rootfs first...but how ?