there is a limit of 600kb for a gameboot to fully work (any bigger it misses part of the movie But as long as it fits on the flash0 it should work (max i've tried is 1.6mb)) and the OE firmwares will require more space on the flash0 for gameboots (dummy the chinese and korean fonts to gain 2.5mb) you can also do the same with fonts just copy and paste. NOTE backup the flash files first and id recommend copy and pasting you new files as apposed to deleting the file first as you may delete the wrong (or a critical) file and have an expensive brick
