Hacking using beta firmware

[test84]

ask if i install a beta firmware (in order to use english interface), what are its cons?
i mean, it has lower game compatibilities or what?
p.s. i want to use it with my PassCard3.
cuz i heard ppl talking about using it over the official 4.6c version, i wonder what pros and cons it has.

its link is like:
beta english version firmware
http://rapidshare.de/files/25203098/G6loader.zip.html