How to Remove the xda-developers ROM

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I have an AT&T Siemens SX56. I'm having trouble since I upgraded to the xda-developers ROM. Is there a way to restore the AT&T ROM?

Thanks in advance.
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yes
if you have a backup (which is a must to take up you flash imho)
you just enter the bootloader and restore from your sdcard

otherwise you have to look at their site for a rom you can use

an .nbf file
or .exe if they use the usb direct flash way