Too late reply, but please do you still have these zip files? Can't get them from the links posted. I have nabi2 and it is too old version NABI2-NV7A-US Andorid 4.0.4.
I just got a new one and trying to update it.
Nabi Specific: Add 2.4.6 kernel
Add GUI option to change or repair file systems on individual partitions. The change is destructive so backup your data including internal sdcard first. This option should make it a little easier to migrate a device from ext4 -> f2fs, for instance. You will find this option under Wipe -> Advanced Wipe, then select only one partition and then press the Repair or Change File System button. If a developer has added f2fs support for your device and we don't have it in TWRP, please contact me via PM to arrange for it to be added.
Various bugfixes to backup and restore
Improvements to USB storage handling
Added a class to search for files to make finding the correct brightness file automatic in most cases
Various other bugfixes and tweaks