Unfortunately, you're out of luck! There is one obvious thing you need to hurdle, 3.55 firmware. And since your console is newly purchased, you might also want to check if the model is CECH-251x. If it is, that's another thing you'll have to worry as per experiences of many. They say models with 251x cannot be downgraded while those with 250x and below are still capable.
For now, that's where you are but who knows right? Things have been moving faster now in the PS3 homebrew scene. It's just a matter of time.. I suggest holding off any updates in the meantime.