The latest firmware for your phone is R4EK001_RED49, but it's only for "America2" language, which means: US English - Brazilian Portuguese - Latin American Spanish. I suggest you to use R4EA031_RED49 firmware. It's a stable firmware, it has "America 1" language also(US English - Canadian French - Latin American Spanish) and a lot of patches. You can find it here: http://www.topsony.com/forum/local_links.php?catid=1468