D-Link released the original firmware for DIR-615 revision G2. Can be downloaded from the following link
http://tsd.dlink.com.tw

DIR-615 Firmware Release Notes
Firmware: FW705BWWB01
Hardware: G2
Date: 2010/9/16

Note:
1. FW version is advanced to v7.05B.
2. FW is approved by TM Telecom.
3. The settings are changed as listed below:

Problems Resolved:
1. Fix device upload config issue
2. Fixed parental control failure issue

Enhancements:
1. Add 802.1p function
2. Temporary remove 802.1p function (web settings still there)
3. Modify default settings value
4. Add new TR069 parameter node
5. Modify DCC password to empty

Known Issues:
1. TR069 SSL connection (only support one way authenticate).
2. Web GUI can’t display new object add from TR069 function.
3. In dual LAN mode, NAT DMZ can’t handle IP unnumber client