If you havent yet, load the RA recovery so you can run a complete backup. Not sure what will happen if your ani is a different size or format than the original. Be prepared for a boot loop
Reboot your phone, to make sure everything is mounted right.
Using your term emulator:
Code:
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
Using the term on device (or a file manager..sometimes they are handy) make a backup of
/system/media/bootscreen/
Delete /system/media/bootscreen/sprint.gif
Code:
mkdir /sdcard/boot_back/
cp /system/media/bootscreen/*.* /sdcard/boot_back/
rm /system/media/bootscreen/sprint.gif
*edit
remembered you don't have busybox. Use a gui file browser and back the directory up somewhere.
reboot phone again.
name the new animation sprint.gif, and copy it to the tools dir in the sdk.
plug in the phone
open a console, navigate to your SDK/tools dir and:
Code:
adb shell
su
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
push sprint.gif /system/media/bootscreen/sprint.gif
and reboot. Let us all know what happens!