How to change resolution YDL back to 480i?

[Poraemon]

I had install YDL by using HDTV and it auto set to 720P. Now I connect it to SDTV,The k-boot screen work fine but in the login page nothing display. How to chage it before go to login page?

PS. I had change all setting in PS3 to default.

[damianks]

At the kboot: prompt you can also just type in ydl480i and hit enter. Then edit your /etc/kboot.conf to make that the default boot image.