I purchased 2 A1 tablets and they have been nothing but trouble ever since. One big issue is I cannot do a system update. If I go to Settings->About Table->System Updates a new update is found. When I try to do the update I see 'The application OTAUpdate (process com.foxconn.download.ftp) has stopped unexpectedly. Please try again.' And I have tried again and again.
I sure hope someone out there has a solution because this is getting frustrating.
You probably are losing conection to wifi during the upgrade process there are several threads about that on the web. I would go to http://download.lenovo.com/slates/a1/OTA/ download the one you want put it in the root of your SDcard and rename it update.zip then power on by holding volume up, this should let you manually flash the latest firmware. If you have specific questions let us know.