Posted on the 1.22 B03 Release Notes
DGL-4500A2 NA release notes history.
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V1.22NA, build 03, 2010/01/19
1. Checksum: 0x0434F4AF
2. fix HNAP security hole
V1.22NA, build 02, 2009/12/23
1. Checksum: 0x04340451
2. L2TP: reboot
V1.22NA, build 01, 2009/12/22
1. Checksum: 0x043384E1
2. patch DNS relay
3. update: Advanced DNS descriptions