Boot archive error or corrupt

A few weeks ago, I got a little problem with my solaris box, namely solaris won't boot because the boot archive was corrupt, *sigh*. Anyway the boot archive in solaris 10 was contain kernel module and configuration file was needed for solaris to startup the system.
Error:

module /platform/i86pc/boot_archive error 3 bad or corrupt data while decompressing file

Workaround:
Boot up your solaris in "solaris failsafe mode", next solaris image will mount with writeable mode on "/a" mount point

ok> boot -F failsafe

bash> rm -f /a/platform/`uname -i`/boot_archive
bash> bootadm update-archive -R /a
bash> reboot