Lenovo IdeaTab A2109 reflash?
I finally found an android image that worked.  Here's what I did:


Plug in tablet via USB
Open Terminal
Boot tablet in recovery mode
Scroll to 'Update from ADB'
In Terminal, run adb sideload [Path to zip file of image]
Let it run
All is well!


I found the link the the image on www.androidtablets.net.

Excerpt:


  Stock 4.1.1 (A2109_A411_03_13_121127): https://docs.google.com/open?id=0BxNORR1JMMjZNTRIUlFlb2JBVTQ
  ACC89EE042C53BE7CC980DC4DAE6A3ED