Finally it's time to upgrade iPad 1 to iOS 5.0.1

My iPad 1 was stuck at iOS 4 for quite a while.  Today I decided to finally move it to iOS 5 so that I can continue using it for jailbreak experiment, and at the same time able to levergae iCloud feature.

The whole process took me a whole night plus the next morning, and eventually I got my iPad 1 running in iOS 5.1 and jailbroken now.  Here's what I learned along the way.

• I tried my very best to jailbreak to iOS 5.0.1 since as of this moment iOS 5.1 unthethered is still RnD Stage.  Eventually I found out that I couldn't get it working as I wanted.  First of all,  it seems like that in order to make the iOS 5.0.1 restore success, I have to have tinyumbrella-5.10.14.exe running in order to block Apple from checking and validating.  I also watched this "How To Fix TinyUmbrella Error "System(PID:4) Must Be Killed!!"" to get TinyUmbrella running.  I also downloaded the firmware from here for iPad 1.  Still keep getting errors like 1604 error, and not even iREB can help bypassing the 16xx problems.  I was so fustrated, and eventually gave up, and just upgrade my iPad 1 to iOS 5.1, did the thethered jailbreak, thinking that I super rarely reboot my iPad anyway.
  
• I still have hope that someday I can do iPad 1 with iOS5 unthethered jailbreak.  Same, however, can't be say for my two A5 based iOS devices (iPad 2 and New iPad).  So as of now, they are still non-jailbreakable, which is why I keep my iPad 1.
  
• My stretegy of my iPad 1 is to keep it very very simple.  I will NOT install anything in it unless I must have them on it.  My experience of my iPad 2 and New iPad is that I installed too much crap in them, and always think like "maybe someday I will have time to enjoy these apps".  Such days rarely happen unless I really force it to happen.
  
• Once I have iOS 5.1 setup, I used redsn0w_win_0.9.10b7 to jailbreak, and the process was super easy.  Afteward I installed Installous, and then some JB apps, and found that all my settings are still there.  Awesome.