IMPORTANT: 

When upgrading from firmware ver.1.0x to 2.0x you will need first to upgrade to firmware ver.2.00.00. 

Here is the link to this firmware:
ftp://files.dlink.com.au/products/DSL-2870B/REV_A/Firmware/DSL-2870B_FW_upgrade_from_v1.01.24_to_v2.00.00AU_06062013.zip

