PavelX1, a registered user over at the XDA Developers Forum, has provided links to uploaded Samsung Focus ROMs. Two firmwares are available, one for AT&T (plus a 4K option) and the other for Rogers, both able to return the device to 7004.

This could prove useful for folk who need to return to factory status with losing a pre-Mango backup, reverting Chevron unlocking, etc. To load the firmware onto your device, one will have to enter download mode. This can be achieved by holding the power, volume up and camera keys while the device is powered down and hold until you see the yellow exclamation mark.

Usual boring disclamer stuff: WPCentral doesn't take any reposnibility for your device becoming unusable (bricked) or if it explodes in your pocket after flashing.

Source: XDA Developers Forum, via: @Dauvx