If you mean the NA firmware then here is the list of changes in each release.
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Firmware: 1.35NA
Date: 12/28/10
1. Removed Securespot Feature.
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Firmware: 1.34NA
Date: 05/20/10
1. Fixed: Bsecure Issue.
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Firmware: 1.33NA
Date: 01/28/10
1. Fixed: Correct HNAP issue.
2. Fixed: DNS relay issue ( WAN Slowdown )
3. Added: Advanced DNS descriptions
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Firmware: 1.32NA
Date: 07/20/09
1. Fix when disable DHCP server and enable DHCP server, LAN PC cannot get IP.
2. Fix using wireless client to configure Access Control rules, cause DUT reboot.
3. Fix UPnP bug.
4. Disable CAPTCHA by default
5. Fixed QRS issue, can't set up wireless setting.
6. Fixed Router DHCP IP range issue.
7. Fixed WPS UI Show Error warning message.
8. Fix potential security leak with CAPTCHA.
9. Fix USB LED issue about Shareport.
10.Fix Shareport HP932C with Wins 7 issue
11. Fix if set more than 8 Trigger or Firewall port in Application Rules. It will show Warning message.
12. Fix bug: When QRS set wan type of rt to DHCP, the rt will not set Primary and second DNS.
Note: This firmware does not allow downgrading to pre-1.3x.
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Firmware: 1.31NA
Date: 04/28/09
1. New SharePort support PC/Mac (Requires New Utility Installed on PC or Mac to work)
2. Add SecureSpot 2.0
3. CAPTCHA (Cryptographic Authentication)
4. Fix DHCP server issue.
5. Modify the turn from "Network USB" to "SharePort" in the option of "My USB Type is:"
6. Add Advanced DNS Service feature.
7. Remove 3G feature (not a supported feature by North America ISP).
8. Fix LLTD wrong icon in Vista.
9. Fix reboot issue when connecting to Internet
10. Fix if set more than 8 Trigger or Firewall port in Application Rules, it will show warning message.
11. Fix bug: When QRS set wan type of rt to DHCP, the rt will not set Primary and second DNS.
12. This firmware can not be downgraded to previous versions.
13. Guest Zone disable SharePort support (USB spec v1.05)
14. Router time is not reset when factory reset.
15. Fix schedule end time error.
Note: This firmware does not allow downgrading to pre-1.3x. Please save your configuration file before the upgrade. After the upgrade, please reset to factory default, then upload the configuration file image.
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Firmware: 1.21 (SecureSpot Not Included)
Date: 11/07/08
1. Added SharePort features.
2. Fixed email notification issue.
3. Patch for Call of Duty 4 and port forwarding issue.
4. Fix when delete schedule rules,guest wireless setting schedule donīt back default value "always".
5. Fix the main wireless and guest zone can be set different schedule time. But the schedule of Guest Zone must be within the schedule of main WLAN.
6. Remove Enhanced IGMP Proxy GUI
7. Fix USB LED light canīt flash with network USB
Note: Please download the SharePort Utility and see the SharePort manual before use.
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Firmware: 1.21 (SecureSpot Included)
Date: 09/30/08
1. Added SecureSpot 2.0.
2. Added SharePort features.
3. Fixed email notification issue.
Note: Please download the SharePort Utility and see the SharePort manual before use.
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Firmware: 1.20
Date: 08/14/08
1. Fixed WPS issue
2. Fixed WAN speed issue
Firmware: 1.11
Date: 12/18/07
1. Enhanced DHCP WAN compatibility.
2. Improved DHCP Client Table List.
3. Utilize latest Widget Version.
4. Removed the support of 802.11d.
5. Added PPtP and IPSec ALG support.
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Firmware: 1.10
Date: 10/25/07
1. Updated Firmware Query UI.
2. Improved LAN performance.
3. Removes ALG functionality.