How Could I upgrade a Letab917 from 4.2 to 4.4 or Upper ROM? - Android Q&A, Help & Troubleshooting

Hi!
A friend has a tablet Leotec LETAB917 with Android 4.2 (Jelly Bean) and he needs the versión 4.4 Kitkat in order to use some App that aren't available for Jelly Bean. I have searched information on the official website, fórums, etc. And I haven't found ROMs with Android 4.4 or upper. Do you know some ROM with 4.4 for this tablet? Or Are there some guide to cook a ROM with 4.4 or upper?
Thanks!!

I have found this guide to do http://forum.xda-developers.com/chef-central/android/guide-android-rom-development-t2814763
And I don't understand where I can find the information that I need to continue with the guide:
1) Device Tree
2) Vendor
3) Kernel
Could you help me, please?

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Hi,
I have been working on JB sorce code for Exynos 5250 based YSE5250 board. It works fine with JB 4.2.2 and is tested on board.
I need to port this board from JellyBean 4.2.2 to Kitkat 4.4.4.
I went through few referances like youtube.com/watch?v=mvxYt3AkbrEand "Embedded Android" by Karim Yagbmour.
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sunil.rockon said:
Hi,
I have been working on JB sorce code for Exynos 5250 based YSE5250 board. It works fine with JB 4.2.2 and is tested on board.
I need to port this board from JellyBean 4.2.2 to Kitkat 4.4.4.
I went through few referances like youtube.com/watch?v=mvxYt3AkbrEand "Embedded Android" by Karim Yagbmour.
I also went through google's official porting guide source.android.com/devices/index.html
I downloaded aosp project and exynos kernel from google git and tried to do changes according to above references. But I am facing issues while building source.
I am still confused about how I proceed with this task.
Is there any good tutorial or procedure to port boards to android or porting existing Android JB to Android KK?
Any directions/help will be appreciated.
Thanks,
Sunil.
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