Just went through upgrading my Lenovo tablet (A1_07 to Ice Cream Sandwich (ICS) 4.0.4.
Ran into a couple of problems and just want to throw it out there just in case someone has the same problems.
The problem was installation. Apparently someone did not do a thorough QA on this.I had to try many times to get the it installed and boot up. First few time, it would just boot to "android" screen after the the installation and stuck there. I tried a few times and it stuck at the same place. I also tried some other suggestions from other sites but nothing works.
I was frustrated and put the version 2.3.4 back (and it was working fine). I then gave the upgrade one last time and amazingly, it got installed and boot up fine but it wouldn't recognize all of the internal memory and my external micro SD card. It only recognize 2GB of the 16GB internal memory.
Just as an experiment, I tried the "Factory Data Reset" and that resolved the problem.
I couldn't be happier.
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