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How to restore the stock Samsung Galaxy S2 ROM

Welcome to another tutorial about using custom ROMs to personalise your phone. Today we’re going to cover how to reverse any changes you’ve made to your operating system and revert your phone back to stock software.

Previously, we’ve shown you how to root your phone and install custom ROMs such as CyanogenMod. We also looked at all the different ways you can keep CyanogenMod up-to-date.

Today we have a video guide to restoring the stock Samsung ROM to your Galaxy S2 (i9100). We will also explain how to reset the flash counter back to zero so nobody can tell that you’ve ever changed the kernel or ROM and there’s no yellow triangle on boot. This means you can sell on your phone in the same condition you bought it in or even return it to the vendor if it needs any repairs done to it.

WARNING: by rooting your phone or installing custom ROMs, you may be voiding your warranty. We take no responsibility if your phone is damaged or bricked by following these instructions.

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The topics covered in this tutorial are as follows:

Booting into Download ModeUsing Odin to flash the stock ROMResetting data and settings to let it boot correctly

All the downloads you need to follow this tutorial are linked here:

→ Odin v3.07 – if you have issues with Odin not recognising your phone when it’s plugged in, make sure you remove all existing drivers and install the official Samsung USB drivers
→ Stock Samsung Galaxy SII ROM (mirror)
→ Triangle Away app

Do you use the stock Samsung ROM with the Touchwiz interface? Or do you prefer to install a custom ROM on your Samsung Galaxy S2? If so, which ROMs have you tried and which is your favourite?

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