I am not sure if the link in this forum is 4.1+ or not, or even if it us available on your device, but there is a thread already dealing with how to flash the stock ROM onto your phone. I couldn't find a.zip of the stock ROM, but then again I didn't look terribly hard. 
If you do find a.zip file that is for your phone, you could always use CWM to flash it onto your phone as well. Either way, follow directions exactly, be careful, and make sure you have the right ROM for your phone before you do anything.
Download the latest Lenovo Stock Rom (original firmware, flash file) for all the available Lenovo Smartphone and tablets for free. Lenovo A369 Official Firmware Android OS, v4.2.2 (Jelly Bean) Free Download - a lot of websites that discuss information about gadgets, including this blog Fun.
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Here's the thread I spoke of: Good luck! --John Galt from my GT-N8013.