I love to break it to you

You underestimateing the difficulty of this.

This is way more complicated than most other devices not only because of small pin size and count. But because of ram and flash sitting on top of cpu. You get all sort of complicated warping. There was once a firm in Germany which was able to solder this configuration, but after they swapt some employes and some machines there were unable to pull this off economically.

The bad yield of gta04A5 second batch:
http://lists.goldelico.com/pipermail...ry/007262.html
http://lists.goldelico.com/pipermail...ry/007271.html


Neo900
http://talk.maemo.com/showthread.php?p=1525427

My guess is that the firm had better tools and more knowledge than you, but of course i would be happy to be proven wrong.