The D-Link DSL-2750U is a popular ADSL2+/Broadband router used in many regions (India, Southeast Asia, Middle East, Eastern Europe). The is one of several variants (others include B1, C1, E1, etc.), each with different chipsets and memory layouts.
Here is a summary you can use or refer to: dlink dsl2750u h w ver j1 firmware updated
(Often has latest J1 builds)