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[jamshal kp]

Which is the latest preview build for lumia 925??? Please please please help me, inform me, now am in version 1511, and build 10586.545,

 

[Chintan Gohel]

Which is the latest preview build for lumia 925??? Please please please help me, inform me, now am in version 1511, and build 10586.545,

the 925 is not eligible for any insider builds. If you use wdrt to go back to 8.1, you cannot officially go back to a higher build

However, you can try this: http://forums.windowscentral.com/windows-10-mobile-how-guides/436253-%5Bguide%5D-installing-redstone-unsupported-devices-x2x-series.html
At your own risk of course