One of the original Openreach branded ECI CPEs, with the easy-to-open case and has been unlocked (with the aid of two clothes pegs) allowing access to the GUI, is available.
The cardboard box carries a label which states --
Item Code: 061513
Contract No: 8002326
Description: NGA ECI-CPE-MODEMS TYPE 1B
ECI Cat No: ON316132
ECI Model: B-FOCuS V-2FUb/I REV.B
Rev: 2A306
Unit of Issue: Each
Quantity: 1
Date of Manufacture: 06/2012
Warranty Expiry Date: 09/2017
S/N: ECI-L131221C605389
Made in: China
This is Lantiq device and, as such, it might be possible to install OpenWRT . . . I have not investigated.