Technicolor TG582n can't change DHCP leases

[#1]

Hi
I've just got the Technicolor TG582n and I'm trying to change the DHCP lease range from 192.168.1.64 - 192.168.1.253 to 192.168.1.7 - 192.168.1.18 but when I click Accept it reloads the page and gives the error "Action failed: could not set interface. Please try again."
Any ideas?

Also, the wireless page says 802.11b/g/n.  Is it possible to force to n only?

[#2]

Are you disabling the DHCP server first?
This may help, it's for older firmware but the same principle still applies.
http://www.o2help.co.uk/change-lan-ip/

[#3]

Quote from: chrish16

Also, the wireless page says 802.11b/g/n.  Is it possible to force to n only?

Unfortunately not!

[#4]

The reason for the error is that there is one or more active leases on that DHCP pool (not that the web interface for the router tells you this  >:().  The lease needs to be flushed from the pool, using the telnet interface, thus:
dhcp server lease flush
Once you've done this, you can edit the pool settings
I found out how to do this in a PDF published on the elecon NZ site - see http://help.telecom.co.nz/ci/fattach/get/5042877/1321574458/redirect/1/filename/Changing-the-TG582n-... for details.
Good luck!