So, you had openATV image, version 7.0. You then flashed/installed the Egami image, version 9.05.
When you flash an image, you overwrite everything in flash memory. Nothing is left behind.
Before we proceed, are you sure the skin will work on Egami? A good indication is if it is available on the plugin server. I have given instructions above on how to install. If it isn't available on plugin server, it probably won't work. Check dedicated Egami skin sections on websites/forums for the skin.
I have had very little experience of the Egami image. Hopefully someone will be along shortly to offer definitive advice.