Technicolor TG582n doesn't allow to change DHCP Pool Range Through CLI

[#1]

I have a telnet connection to the TG582n.

I have only one pool in DHCP:

Idx Pool              Address Range         Intf              Admin  Alloc   State
0   LAN_private       192.168.1.[200-250]   LocalNetwork      up     dynamic static

I am trying to use a simple cli command:

{lt_pdpd}=>dhcp server pool config name LAN_private poolstart 192.168.1.201, but it gives me an error:

Error : Pool address range overlaps with other pool address range.

Also tried a little bit different command:

dhcp server pool config name LAN_private intf LocalNetwork poolstart 192.168.1.100 poolend 192.168.1.109 netmask 255.255.255.128 gateway 192.168.1.110 , but it gave out another error:

Error : Unable to configure LAN_private

If I try to change the pool through GUI interface, everything works. Every comment is much appreciated.