PS Vita boot logo is located in
display.skprx which is located in
os0:kd.
Prototype firmwares that are lower than 1.00 have a different boot logo, different than that of retail firmware.
To extract the boot logo, you have to
get a decrypted copy of it by either using VitaShell or pup_fiction.py.
On firmwares higher than 1.00, the boot logo is
gzip'd.
Anything lower, it's
zlib'd.
FOR GZIP (FIRMWARE HIGHER THAN 1.00):gzip format has a
header starting with the
magic number of 1F 8B in hex. After those two bytes comes the byte that represents the compression method, in our case
08 which represents "
deflate".
You can locate size indicator and manually find the end offset of the gzip file or you can just look for
bytes 00 E0 1F 00.
Copy that stream
including the header to another file (I prefer HxD for this job) so that
our new file starts with the header and save it with
.gz extension. Not tarball'd like usual so no .tar.gz.
When you extract the gzip, resulting file will be the
raw framebuffer with the size of 960x544 in RGB32 format.
FOR ZLIB (FOR FIRMWARE LOWER THAN 1.00):zlib format has a
bunch of different headers:
The one we're looking for is
78 9C (which indicates that it's compressed with the default compression level of 6).
Copy the rest of the file
including the header to another file (I prefer HxD for this job) so that
our new file starts with the header and save it.
After that, you can just use
offzip on the new file and the resulting file will be the
raw framebuffer with the size of 960x544 in RGB32 format.
After extracting the raw framebuffer, you can load it in your viewer of choice
(with the size set to 960x544 and the format set to RGB32), mine is
rawpixels.net.
Thanks to
Princess of Sleeping and
SKGleba.