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The place to find hacked firmwares is the wonderful Internet. Search Google for it, various people put up mirrors from time to time. There used to be a stable, continuously up mirror at the I-hacked site, but they removed the file from their server so new mirrors have appeared, and Efficient doesn't seem to care anymore. Not surprising since the Speedstream 5260 and 5660 have both been discontinued for more than a year now.
Try looking here first:
Look for "5260 to 5660 Update/Upgrade Files Kit" if that doesn't work try Google.com to search for the kit's file name 5260-5660Kit.zip or the actual file upgrade.img that is in the kit. Please do not ask in the Forum for Firmware.