How to Update Android on ET1?

Hello Community,

 

I have a ET1 Tablet with Android 2 and want to Update it to Android 4.

How do I do it?

 

I found some Documents Regarding that, but I have no StartUpdLdr.apk - and I also have no FullUpdatePackage.zip.

I downloaded the actual Android Version from Motorola, the File is named ET1N0JenRU02702479.zip ans has around 200 MB.

So, what should I do with it?

 

Any help would be appreciated.

 

Greetings,

 

Thomas