BT (British Telecom) locks access to their 5861 with crippled Firmware.
Visit here »
5861.uk-bug.net/ for all the details on working with the BT 5861 including unlocking the unit and updating the Firmware to an uncrippled version. (Thanks to
eusty 
)
Note: Since the »
uk-bug.net web site is abandoned and gone a few (a very few) pages have been discovered at the Internet Archive's Wayback Machine at »
Web.Archive.Org but not all the links or all the images work, however the text of the articles appear to be complete. If any content is missing then it is gone/lost as the Web Archive didn't save it. There is no other known archive available.

Section: EN5861 Information.
»
web.archive.org/web/200509142232···n-2.html· Unlocking The Router
»
web.archive.org/web/200508291938···-p1.html
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got feedback?by Doctor Olds 
last modified: 2009-09-11 19:57:33