samsung galaxy S3 LTE i9305 update to 4.3 jelly bean

[sujay_sjn]

Hello

I have Samsung Galaxy S3 LTE - i9305 (unlock) mobile phone, with prepaid sim from Singtel, Singapore, trying to update Jelly bean version 4.3 through Samsung Kies. but getting message - Current firmware version is not supported

From CheckFUS app

PRODUCT CODE - i9305TADFTM
PDA - i9305XXBLL3
CSC - I9305DBTBLL3

Please help me to update.

Thanks
Sujay