[Galaxy Note Pro 12.2 Original Android Development] esgie:
Stay cool. I am a (quite) young man, but I have patience, too ;]

No output when running *something* as su = faulty su installation (maybe)...

Please download SuperSu 1.99 (flashable cwm version) from here: http://xdaforums.com/showthread.php?t=1538053 and put it somewhere on internal sdcard

Download my "almost-working" TWRP recovery image: http://www53.zippyshare.com/v/30690424/file.html

Put it in internal mem so its path will be /sdcard/twrp2.img

Run terminal emulator (CAREFULLY WITH THE PARTITION NUMBERS!)

su
dd if=/dev/block/mmcblk0p15 of=/sdcard/recovery.backup.img
sleep 1
dd if=/sdcard/twrp2.img of=/dev/block/mmcblk0p15
sleep 1
sync
reboot recovery

In recovery, flash downloaded supersu zip. Reboot.***

Try commands again.

Maybe your busybox is bad? Can you tell me the output of command busybox written alone without further params?

***(btw the recovery may be useful, but it is not-fully-working, however, it is working AT ALL... be aware of issues:

- it cannot write backups to exfat external cards, vfat/fat32 only

- it may mess the selinux context, especially for cache partition after wipe. solution: from twrp run advanced -> console (or terminal? dont remember) and run

restorecon -R /cache

- if u ever have a bootloop after flashing a (even reliable...) zip, you should get back to twrp, click mount menu, mount everything, switch to advanced -> console and run:

restorecon -R /system

restorecon -R /data

restorecon -R /cache

selinux contex will be fixed BUT it will mess context for su binary, so in the end flash supersu again and reboot, everything will be ok.

If you want to revert, just do:

dd if=/sdcard/recovery.backup.img of=/dev/block/mmcblk0p15

).

And last but not least, kernel which I have promised (BUT if you use it, I will lose my only tester heheee):

http://www46.zippyshare.com/v/63874309/file.html

Please be aware that there are some other tweaks included (like unsecure adb, faster filesystem mount options but with higher risk of data loss, etc).

Put b4.img to /sdcard/b4.img

Run:

su
dd if=/dev/block/mmcblk0p14 of=/sdcard/boot.backup.img
sleep 1
dd if=/sdcard/b4.img of=/dev/block/mmcblk0p14
sleep 1
sync
reboot

You can revert to stock by dd if=/sdcard/boot.backup.img of=/dev/block/mmcblk0p14 (or by flashing full stock by odin). Would be glad if you can confirm that mode is permissive using this repacked kernel (HOPE IT WILL!!!!) and after some time you'll flash the backup back, to help me solving the case, as i suppose that there IS possibility of permissive without the kernel flash and I need a tester ;} It would be reeeeeeaaaaaaaally nice...

BE AWARE THAT:

- it's for note pro 12.2 LTE ONLY!!!! also called viennalte or SM-P905... It WON'T work on other devices and it may damage them (for example, coz of different mmcblk numbers...)

- messing the mmcblk0pxx number may cause an unrecoverable harm to your device (especially if you overwrite bootloader partitions or your efs partitions where unique imei is stored), it's 14 for kernel (boot) and 15 for recovery

- your knox WILL be tripped (if it hasnt been tripped yet... but it's not very probable :P )

- on the very first boot screen, a warning messages may appear in the left-top corner, about some warranty stuff. Ignore them, they'll disappear after reverting boot/recovery to stock.

Regards.