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if you accidentally updated to the 2.0 firmware or you just rather downgrade to 1.1.4, you may use this 1.14 software solution

Here. you can read a detailed tuturial on how to downgrade your original iPhone from 2.0 to 1.14. To follow this tutorial you will need to have iLiberty (Windows, Mac), iTunes 7.5 (Windows, Mac), and the 1.1.4 firmware, as well as your favorite unlocking method.

The new iPhone firmware 2.0 is live and available for download right now.  If your device currently has a software version prior to 2.0 (1.x) and you are updating to software version 2.0 or later, all data on your device will be erased in order to perform install the new software. In this case, iTunes will offer to create a one-time media backup of your device depending on what content is on your device and what content is stored in the iTunes Library you are connected to. You should ensure that you have enough free space on your Mac or PC to accommodate a backup that matches the capacity of your iPhone or iPod touch.

In order to install the firmware, you will have to do it manually by pressing the Option key when pressing the ‘Check for Update’ button in iTunes. Then select the .ipsw file manually. If for some reason your download is a ‘.zip’ file, rename it to ‘.ipsw’ before proceeding

If you can download the update here
iPhone Firmware 2.0 Hands-On

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