how to upgrade firmware

[eloelo22]

good day to everybody

my sister gave me a phone samsung galaxy s2 i wanted to upgrade it to 4.0 but kies cannot identify the firmware i found out that the phone was rooted here is the info on the setting about phone
model number: GT-I9100
ANDROID VERSION: 2.3.3
BASEBAND:M250K.UB23.1040.KT
KERRNEL:2.6.35.7-I9100XWKDD-CL161513 root@DELL103 #2
BUILD NUMBER:GINGERBREAD.XWKDF

and when i dial *#1234# the info is
PDA:I9100XWKDF
PHONE:M250K.UB23.1040.KT
CSC:UNKNOWN
BUILD INFO:FRI APRIL 29 08:31:21 KST 2011

can i upgrade my phone to 4.0?
can someone point me to the right direction i a bit lost i don't know what to do help would be appreciated

 

[ironass]

good day to everybody

my sister gave me a phone samsung galaxy s2 i wanted to upgrade it to 4.0 but kies cannot identify the firmware i found out that the phone was rooted here is the info on the setting about phone
model number: GT-I9100
ANDROID VERSION: 2.3.3
BASEBAND:M250K.UB23.1040.KT
KERRNEL:2.6.35.7-I9100XWKDD-CL161513 root@DELL103 #2
BUILD NUMBER:GINGERBREAD.XWKDF

and when i dial *#1234# the info is
PDA:I9100XWKDF
PHONE:M250K.UB23.1040.KT
CSC:UNKNOWN
BUILD INFO:FRI APRIL 29 08:31:21 KST 2011

can i upgrade my phone to 4.0?
can someone point me to the right direction i a bit lost i don't know what to do help would be appreciated

Hello and welcome to Android Forums eloelo22!

You have the Korean, M250K, variant of the Galaxy S2. Therefore, you should be careful what you flash to it as a lot of the stuff you will come across is for the GT-i9100, International, model and may not apply.

As you say the phone has been rooted, Kies will not recognise it for updates, see post #1, here.

It looks as though someone has, "converted", it to GT-i9100 judging by the firmware.

I would caution you to proceed carefully on this phone as it is not a straight forward case of flashing, for the reasons mentioned above.

I would suggest the best place to obtain more information is the M250S/K/L thread on xda developers, here.

Hope this helps.