2. unzip it a folder on your pc
3. boot into recovery
4. then open a cmd terminal, switch to the folder you extracted busybox into and do 'adb push busybox /tmp'
5. "adb shell cat /proc/partitions | grep mmcblk0p19", it should return a single line confirming that mmcblk0p19 exists
6. "adb shell chmod 755 /tmp/busybox"
7. "adb shell /tmp/busybox mkfs.vfat /dev/block/mmcblk0p19"
that should work, all thanks to unaszplodrmann (he explained it to me)