You can update it by youself. On teh wegsite of SE you will find the software for updating. It will always update the software for new version but not for another software. You can also update in some small Phonestores - ere in Vienna is this verry common. If you want to flash to the custom software you can do it just at Davinci team (just google this name) it will cost 10 euro. If you do not have any idea you can also flash you phone on some small Phone stores. The price is between 15 and 25 euro.
I will recommend the stores because they do not charge for misfailed flashing. With davinci you will also get the money back, but you have to write them and it takes approximetly 4 days.
Good luck for your flashing
Best Regards from Vienna