Hi i just update to 2.3.4 and try to root it and work fine with me
Download this file and move it to your NS
after your flash the recovery then ..
On your phone, use the volume key to highlight "recovery". Press power to boot into recovery.
in the recovery screen, select mounts and storage
go back, and choose install zip from sd card
choose "choose zip from sd card"
pick the su package zip file you copied over earlier
when done, reboot.