To add a power-off wallpaper to the 600, right now only PRS+ provides it.
There a lot of steps, but none of them are hard. As for step-by-step how about
this.
To run through them:
1. download the
PRSP_600_base_flasher_1.0_by_amutin.zip and
PRSP_600_2.0.10alpha_Installer.zip from the
download section.
2. unzip
PRSP_600_base_flasher_1.0_by_amutin.zip and step through the "
Installing base image (needed by 600)"
instructions 1-6.
3. Step through the "600"
instructions 2-4.
PRS+ should now be installed, lets install the wallpapers:
4. create the sub-directories "
/database/system/PRSPlus/wallpaper" on your reader's main drive. beware, it's case-sensitive.
5. copy your wallpaper images into that directory.
That's it! turn off your reader and viola! no more blank screen.