yoy people asked me to comment after reading the thread.that i did.i followed : talk.maemo.org/showthread.php?t=71879&page=140
i wanted to go back to kernel 477.how to do that? i followed the steps in that page and got this:
~ $ sudo gainroot
Root shell enabled


BusyBox v1.10.2 (Debian 3:1.10.2.legal-1osso30+0m5) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/home/user # apt-get --reinstall install kernel-power=2.6.28-10power47 kernel-power-modules=2.6.28-10power47 kernel-power-flasher=2.6.28-10power47
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Version '2.6.28-10power47' for 'kernel-power' was not found
/home/user #