Or if you don't feel like deleting all your data, you could just change this registry entry:
Restart and check for updates. GDR3 will start downloading.
NOTE: You do not need to change back this entry, as this is always the first to receive updates (was first to receive Portico, GDR2 and now GDR3)
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Prank Google Chrome
- Fool your friends into thinking you actually have Google Chrome on your Windows Phone!
Samsung ATIV S GT-I8370
OS: 8.0.10512.142 (GDR3)
Firmware Revision Number: 24188.8.131.52
ROM: UK OPEN
Interop Unlocked: ✔