Here are all the MD5 Checksums that I could find. Hope this helps and isn’t information overload.
999605c3f4ae4e94af89de5b1c78c052 *FIRMWARE.BIN.orig for 6520-T2B-UNRESET, CVS Red
cbad7f874a7d8819c830c448209cbef5 *FIRMWARE.BIN.unlock for 6520-T2B-UNRESET, CVS Red
Patch Info: [6910] 01->02 [6AF4] 27->24 [6B30] 30->32
Patch Status: Success on four cameras
ccb952eb7f6f2f09781e27b721b9b8c4 *FIRMWARE.BIN.orig for 6520-T30-UNRESET, CVS Red
5b6bd7b07c7780f178d19728be3d9883 *FIRMWARE.BIN.unlock for 6520-T30-UNRESET, CVS Red
Patch Info: [6910] 01->02 [6AF4] 27->24 [6B30] 30->32
Patch Status: Success on two cameras
ccb952eb7f6f2f09781e27b721b9b8c4 *FIRMWARE.BIN.orig for 6520-T30-RESET(Factory), CVS-Red
5b6bd7b07c7780f178d19728be3d9883 *FIRMWARE.BIN.unlock for 6520-T30-RESET(Factory), CVS-Red
Patch Info: [6910] 01->02 [6AF4] 27->24 [6B30] 30->32
Patch Status: Success on one camera
ccb952eb7f6f2f09781e27b721b9b8c4 *FIRMWARE.BIN.orig for 6520-T30-RESET(by ME*), CVS Red
5b6bd7b07c7780f178d19728be3d9883 *FIRMWARE.BIN.unlock for 6520-T30-RESET(by ME*), CVS Red
Patch Info: [6910] 01->02 [6AF4] 27->24 [6B30] 30->32
Patch Status: Success on one camera *Used teslafreak’s unlock procedure
488c23a5ca5aa29d8d0bf198ddae619b *FIRMWARE.BIN.orig for 6510-T28-RESET, CVS Blue
8b79457d4f3b47bcdeaf4e5437fcff6a *FIRMWARE.BIN.unlock for 6510-T28-RESET, CVS Blue
Patch Info: [6991] 01->02 [6B85] 28->24 [6BC0] 30->33
Patch Status: Success on one camera
488c23a5ca5aa29d8d0bf198ddae619b *FIRMWARE.BIN.orig for 6510-T28-UNRESET, CVS Blue
228c80baf24e81e070a0d0a7a40e6968 *FIRMWARE.BIN.unlock for 6510-T28-UNRESET, CVS Blue
Patch Info: [6991] 01->02 [6B85] 28->24 [6BC0] 30->33
Patch Status: Success on one cameras
3dee9e9fe6598de5d82a0d3ec10081e6 *FIRMWARE.BIN.orig for 6520-T28-UNRESET, CVS Blue
f6d96487dcdcf0ffe37d521d219b399d *FIRMWARE.BIN.unlock for 6520-T28-UNRESET, CVS Blue
Patch Info: [6991] 01->02 [6B85] 28->24 [6BC0] 30->33
Patch Status: Success on three cameras
e8dcc8a3ba8f37266e708b263fa466bd *FIRMWARE.BIN.orig for 6520-T2F-UNRESET, CVS Blue
788921c2011d3f38e731d214c0a5bedd *FIRMWARE.BIN.unlock for 6520-T2F-UNRESET, CVS Blue
Patch Info: [6991] 01->02 [6B85] 28->24 [6BC0] 30->33
Patch Status: Success on two cameras