OK, so this afternoon, i bought the S500i. It's great and everything better than my last, but, the menus and themes sucks(I tought I was gonna get the beautifuls green/blue/purple icons but instead I have ugly ones), so I search a little on the web, and I see that I have to flash my phone in order to get something beautiful.So I downloaded XS++ to see what firmware was on my phone and i got this:

19:45:34| Did not receive 0x5a. Continuing
19:45:34| Baseband ID: 9900
19:45:34| Protocol Version: 3.1
19:45:34| Warning: IMEI name does not match GDFS name (IMEI:NULL GDFS:S500)
19:45:34| ...using GDFS name
19:45:34|
19:45:34| Profiling SEMC phone...
19:45:34| Platform: DB2020
19:45:34| OTP CID: 51
19:45:34| EROM CID: 53
19:45:34| EROM Color: Red
19:45:34| IMEI: 35912202xxxxxx
19:45:34| Phone ID: S500
19:45:34| Region: FRANCE
19:45:34| CDA: CDA102765/115 R1A
19:45:34| Firmware Version: R8BE001
19:45:34| EROM: R3A022
19:45:34| Ready for operation!

Apparently with my firmware I can't change anything, Is that true?And if it is, what can I do in order to change that? Can I flash my phone with an older firmware(if so, witch one? I live in France but english is fine by me) and what are the best themes for my phone?
In fact, I need everything, first time I do this, so please guide me ^^".Thanks in advance.

u need to work with JD flasher

Well u dnt need 2 flash the firmware to get flash theme on ur phone

You're CID53, unlucky mate
Well; using JDFlasher, you can flash your phone to other moddable versions and then change the FS items, though patching is a bit out of the question.
Look in the tutorials section for Advanced Usage | JDFlasher