Lumia 620 with WP8.1 or GDR3 ?

compu829

Senior Member
Nov 5, 2006
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@StevieBallz It could be a WP 8.1 build. IT may have a system partition on it as well...Remember this is from a developer unit. As long as the bootloader knows how to chain-load the SD card, the phone can boot it fine. I can see this happening because the developer has a stable OS load on the phone's internal storage (WP8 GDR2) and then would use the SD card to boot into WP 8.1 for testing.