You can update your Nokia E52 firmware by OTA (Over-The-Air) or via Nokia’s Software Updater, Ovi Suite on Windows PC . The Nokia E52 does have UDP (User Data Preservation), but its always a good idea to backup all your personal data before updating the  firmware.

Note: It may take some time before the new firmware is available for your region.

Changelog for Nokia E52:-

Data package content, Changelog, corrections or changes :
Updates:

• Browser upgrade into 7.2.6
• Cherry updated to version 2.1
• Freestyle Baseline 3.0 (latest version) update
• QuickOffice upgrade into 6.2.439
• New languages introduced, Office 2007 compatibility
• OVI Music client Inc9Br5 update
• Music 3.0: full album purchase, PIN less activation
• Lotus Notes Traveller 8.5.1 update
• My Nokia update
• OVI Store 1.6 update
• OVI Sync 2.0 update
• OVI Files widget 1.2.3.0 update

Removals:

• Windows Live removal

CHANGES AND IMPROVEMENTS:

• New chat functionalities for the users
• Microsoft Office Communicator added to vanilla SW UDA content
• Nokia Messaging for Instant Messaging / Nokia Chat 2.0 added to vanilla SW UDA

Content:

• Improved Email, Calendar and Contacts experience
• Performance improvements
• Stability and usability improvements
• No changes to vanilla memory cards
• HW Specific change:
• PR3.0 includes SW Support for Rapuyama 1.13 (previously Rapuyama 1.11 supported).

The phone main processor version is going to change. This component needs the software update because of component ID’s are determined in software.

• There are no electrical changes which can effect to RF performance or normal customer use.
• This HW change will be implemented for production during P2 period in 2011. Next

Maintenance release PR4.0 is going to be mandatory update.

• Altogether 450+ errors are fixed.

New Feature :

• Microsoft Office Communicator 1.7 integrated
• Nokia Messaging for Instant Messaging / Nokia Chat 2.0 integrated
• Bloomberg added

[Via A2Phone]