Default Update built-in ADB of my Android Tablet.

Hi guys,
I've got a question...
But first, STORY:
I have a tablet with stock Android 4.2.2 rooted and a Moto G (not rooted). I had connected my Moto G (4.4.2) to the tablet over an USB Dongle with USB debuging enabled and my tab found my Moto G. So I started the terminal Emulator with SU permisions on my tab and typed:

su
Adb devices

My tab listed my device as "device" and i had control of my Moto G.

Now I updated my Moto G to 4.4.4 and when I connect my device now to my tab, my Moto G is listed as "offline". Thats Bad.

I tried:
- toggle USB debugging
- reset adb Permissions
- reboot Tab and Moto G
- used up -to-date ADB binary of the Android SDK for Linux (failed: magic 7f45)

I think I need to update my build-in ADB binary of my tab to get succesfully connected.

Can anyone send me a Built-in ADB binary from an Android 4.4 device, please? I think it can be found in /system/bin .

Thanks to all!

PS: Sorry for my Bad english.