Instead of adding the new user to the sudoers file, you can use the linux group feature. In this case you use sudo usermod -a -G sudo <username>....
Re: update bricked my udoo quad I'm not sure if this is caused by the update but... If I boot my udoo without a keyboard and mouse directly...
As for google play store, I had been testing a Kindle Fire HD earlier this year which doesn't provide the Google store by default either. After...
I haven't tested this personally but I would assume any 3G/4G USB stick with Linux support would work as well if you just need network...
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