If you haven’t already read, you do not need to do this anymore. An easier web-based jailbreak is available over at http://ispotunrestricted.com/2.0/. Only downgrade if you continue to have issues with the 2.0 version.
This post is going to be quick and straight to the point.
You can downgrade your firmware with this file, it will take you back to the August 5th version, the version number might be different but it is the same rootfs.bin and kernel.bin files. It will not have the updated OUIs that the Aug 15th file has. However, you will be able to upload custom configs again. The firmware was created with the use of the fwtool created by oz_paulb over at http://hackspot.net/iSpotBlog/.
Just download the firmware file below, and update your iSpot like any other firmware.