CSC is the consumer software customisation and is specific to geographical region and carriers.Should i do this? Ok i'll try thanks alot for information...
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GT-S6102 with no custom rom
It contains the software packages specific to that region, carrier branding and also APN settings
for data connection, MMS etc for your service provider.
For more detail: http://forum.samdroid.net/f70/rom-guide-official-i9100-firmwares-download-xda-developers-6118/ #1
CSC also affect wifi tethering (wifi HotSpot).