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Hello, 
 
I think I found faster solution for ethernet problem. 
 
It is happen when you install Linux on SD card and then after quick format try to use same SD card with Android OS. 
 
I don't want to wait ages for full format with zeroing, so after quick format i copy 1,5GB file(something to overwrite SD card for example movie) into SD card.  
Then using PhoenixCard I install Android OS and ethernet start working normally. 
 
Probably something remains in SD card and it cause problem. 
 
 
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