I've saved my nook.I wish to express my gratitude to speedman2202,wozhere and Renate NST for your immense practical help.
To conclude the experience that I learn from unbricking my nook touch, there're 2 issues to mention:
1.In my first step,Nook can be formated to restore factory system With the CWM and Touch-Formatter v2.http://forum.xda-developers.com/show....php?t=1475613
2.In my case,after reboot, the nook is stuck in 'Read Forever' sopt and windows cannot recognize Nook USB drive.Do the following steps as speedman2202 directs
Everything shall be retored and the Sun will rise tomorrow again
another important thing to mention is that u can resore system with every correct IMG file as long as the model match. i actually write my system with a img file i download from another guy's img. Now my system is a android version in which i can install some apps.
Thanks guys again. Have a nice day!!
did u download nook image from website and write it to ur own nook??!!!
i hope not!!!! :\ , if u do ... ur wifi wont work .... just u can use ur nook as a e-reader only and no benefits to root :|