I don't see any S730 updates, but it could be the Spanish web page is wrong, because every time it tells me to pick the phone model from the list, yet I cannot see any list whatsoever. And I have tried with both Opera and Firefox browsers...
I can see the rom update (altough my Russian is not so good ) but if I click on the Phone software update the ROM update disappears and I can not come back to that page unless I click on the link you provided.
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