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The Windows Phone developer preview update which started rolling out today will fix the issue seen on some devices with relation to bitlocker yes, it should also allow the Cyan update to now be delivered to the phone when available. Give it a few days to see what happens.
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This week an update to 8.1 will pushed to Preview for Developers users.
This will allow Preview for Developers users to update to Cyan when it is available for their phone.
I'm also still waiting for the Nokia Cyan update for my Developer Preview installed unlocked 1520. Is there any further news on availability in the UK?
“Windows Phone 8.1 will become available for […] every Lumia […] running Windows Phone 8 […] in a [firmware] package called Lumia Cyan – starting this summer.” When Lumia Cyan is available for your Nokia Product Code, you get a notification on your phone automatically (see Menu » Settings » Phone Update). More about this there …
In the Nokia Software Recovery Tool, what is your 7-letter code (Nokia Product Code)? No Windows computer or USB: The same code is printed on your phone. That code determines your firmware variant which determines your current version. We can check together whether you have the correct variant, only with that code.
Moved to Nokia Lumia Board