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www.ptcrb.com/vendor/complete/view_complete_request_guest.cfm?modelid=21035
So I presume 6.1.B.0.544 will be the ICS firmware update. Looking at the time difference between the certification and the update availability ICS should be in within two weeks.
Hopefully its a stable update to 4.0.4 and btw thanks xkvicd for sharing this 
I updated to .184 just 2 days after certification.
It takes about a week or to to be available in my region. Is there a way to find out what region is my phone software for ? I bought it from a retail store and it wasnt locked to a local carrier.
if you want to know where does your phone come from, contact a Sony Moderator with your IMEI through Private Message and they will tell you.
There isn't an specific amount of time after the update will be released after it has being certified.
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unrelated topic, if you have some time please check this thread
hopefully this should be 4.0.4 and should solve a lot of problems we sola users have been facing for quite some time ..
I would highly appreciate if they a week more but provide a bug free update.:smileyhappy:
In the website, it says the date certified was Aug 23. So when will it be available for our phones?
If the FW was certified, It will come to us within in Two Weeks.
it varies per region