I’ve got a number of Android devices including the original 2012 Nexus 7 , WiFi tablet. Some months ago Lollipop was presented as an update and I installed it. This followed if I recollect by a further increment to 5.1.1 . Wow what a mistake. The unit went from a having a fast response to a complete lemon , all in space of a few button clicks on my part. With a forth coming flight in mind I decided to revisit and see if I could improve it’s performance in any way. (The Lollipop update’s poor performance is well documented on the Web). I first considered installing an alternative (to Android) ROM in the hope that this might improve matters. I decided that for me the simplest route might be to install the previous KitKat (4.4.4) release as this ran sweetly on the device.

Reading some of the blogs there seem to be two techniques in doing this. (a) a long hand method (b) Quicker,  using the Nexus Toolkit see http://www.wugfresh.com/nrt/

I decided on the latter and followed the instructions on this fine article:

http://goo.gl/HZqYhE

You’ll need to download the appropriate image file for reflashing, so take care in identifying your model correctly via the Toolkit. Just be aware he article images seems to reference an earlier release of the Tookit in the images, however  the instructions worked for me seamlessly. You obviously need to concentrate and focus on all of the commands. So don’t do this unless you feel reasonably confident.

On returning to 4.4.4 I was slightly shocked to see that the Tablet was already downloading Lollipop! The version I’d just erased… I followed this article and appear to have now disabled the Google Update Service. OK, I’ve only just done this but things seem back to normal now and I can sensibly use the Tablet once more. You need to Root the device before being able to disable the Service. Another fine article here: http://goo.gl/E9MZP5

I must add I’m not qualified to answer specific questions on this process, but can tell you with care it seems to work. Good luck and hanks for reading.