Custom Boot Splash is a plugin by PSVita developer Princess Of Sleeping who seems to be quite fond of messing around with system files.
This plugin allows you to change your PSVita/PSTV’s boot screen to any static image you desire which, in my opinion, increases the coolness factor of hacking your PSVita ten-fold! Obviously, this supports FW 3.60/5 as it requires Enso to work.
In order to avoid any confusion, what is shown when the PSVita boots is explained here in order:
Boot Logo – this is the Enso or PS logo
This plugin can’t fully bypass this so it’s momentarily shownn
Custom Boot Splash takes over and your custom image is shown
This replaces the Enso/PS logo which stays there for a few seconds without this plugin