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By extracting attached flashable zip, you'll know how to change Galaxy Tab 3 8.0 boot logo.

WARNING: Don't use any image created or edited by Linux image editor (i.e. Gimp, Gwenview, Krita), you'll got a black screen of death! A simple, powerfull, nice, and free Paint.NET - but Windows - image editor worked!

A pdn file (Paint.NET multi layer image) attached here as a template for your convenience.

BACKUP: If something goes wrong, flash param-samsung-t311.tar.md5 using Odin as PDA or Heimdall v1.4.0: "sudo heimdall flash --PARAM param.bin".

Some technical explanations:
There is a script inside my CWM flashable zip. This script will flash a logo.jpg overwrite the original one. I called this in-place flashing because only logo.jpg is replaced, the other files in the param partition untouched. Attached boot logo CWM flashable zip should be compatible for all T31x family but I only test it on T311.
Code:
#!/sbin/busybox sh

# Galaxy Tab 3 8.0 boot logo changer script
# Ketut P. Kumajaya, Nov 2013

# Extract device param.bin
dd if=/dev/block/platform/dw_mmc/by-name/PARAM of=/tmp/param.bin bs=4096
mkdir /tmp/param
cd /tmp/param
tar xf /tmp/param.bin

# Replace logo.jpg, repack param.bin
cp -f /tmp/logo.jpg /tmp/param/logo.jpg
rm -f /tmp/param.bin
tar cf - `ls | sort -t.` > /tmp/param.bin
dd if=/tmp/param.bin of=/dev/block/platform/dw_mmc/by-name/PARAM bs=4096

cd /tmp
rm -rf /tmp/param
rm -f /tmp/param.bin
Yes, Galaxy Tab 3 8.0 param.bin is a plain tar file but you have to use a correct command to repack it.

Flash attached CWM flashable boot logo at your own risk! I only test it using PhilZ Touch recovery. Please reboot into recovery before performing a normal reboot!



Images courtesy of http://www.imagesweb.org/ and http://www.wallpaperscraft.com/ .
Attached Thumbnails
Click image for larger version

Name:	superman_mini.jpg
Views:	33336
Size:	11.0 KB
ID:	2394822   Click image for larger version

Name:	android_mini.jpg
Views:	33210
Size:	6.5 KB
ID:	2394823   Click image for larger version

Name:	sky_mini.jpg
Views:	33104
Size:	10.6 KB
ID:	2394824   Click image for larger version

Name:	violet_mini.jpg
Views:	33061
Size:	6.4 KB
ID:	2394825  
Attached Files
File Type: zip logo.pdn.zip - [Click for QR Code] (4.24 MB, 2800 views)
File Type: zip param-samsung-t311.tar.md5.zip - [Click for QR Code] (550.0 KB, 3107 views)
File Type: zip superman-boot-logo-t311.zip - [Click for QR Code] (308.3 KB, 2205 views)
File Type: zip android-boot-logo-t311.zip - [Click for QR Code] (570.8 KB, 1537 views)
File Type: zip sky-boot-logo-t311.zip - [Click for QR Code] (516.5 KB, 1704 views)
File Type: zip violet-boot-logo-t311.zip - [Click for QR Code] (360.9 KB, 1866 views)
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