Will updating to IOS 7 beta 6 erase my flash?

I have an iPhone 4S flashed to T-Mobile heres how to install it but i don't know if it will erase my flash and i'm already on 6.1.3 so i can't jailbreak.
Step 1: Launch iTunes and connect your iPhone with your PC via USB cable.

Step 2: Right click on your iDevice on iTunes and take a backup (or backup to iCloue)

Step 3: Restore your iPhone to iOS 6.1.3 (or 6.1.4 if you have iPhone 5)

Step 4: Set up as new iPhone - do not restore from backup.

Step 5: Hold down the Option key in OS X (Windows use Shift key) and click on "Update" not on "Restore"

Step 6: Select the iOS 7 beta file you downloaded, updating the device to iOS 7 beta. Done.

By updating to iOS 7 you will only write over the previous iOS. In this case 6. You are only updating the operating system. Your not updating hardware.

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