So I am trying to "downgrade" my MBP 6.2 from High Sierra back to the original OS which was 10.6. Now the original HDD is out and a 256gb SSD is the replacement drive is installed and formatted as GUID partition with MacOS journaledFS. The grey system restore DVD will not boot. The retail from Apple Store SL 10.6.3 DVD won't boot. I tried creating an image of the DVD's and putting them on USB drives. I tried external superdrives. I tried restoring the image from the USB drive to the blank internal drive. All I get when trying to boot the older OS is a whitish screen with the grey Apple logo. no progress bar...nothing. If I hold Option down I get 2 selections... Windows (not installed) or the USB drive with image. if I select windows, it goes to a black screen with no operating system found. The other boot selection result in the white screen and grey apple. Is my firmware needing a reset? How do I do that? I have not had bootcamp on here in ages. Like literally 5 years. I had forgotten I even had it since I deleted the partition way back when and extended the macOS partition back to use all the drive space. So any ideas? Firmware reset?