All thanks need to go to Cynique over at motofans.ru for this excellent firmware. It's a combination of R541_G_11.52.13R, the Russian Firmware, and R541L7_G_11.00.16R, the Brazilian Firmware. In my opinion it's a pretty good combination.
Summary
• Quad-Band - Yes
• Edge - enabled by default
• 4 USB modes: Modem, Mass Storage, USB net, Webcamera
• Battery Life - Average (1-1.5 days)
• Speed - Average
• Camera Quality - OK
• Camera Photo Autosave - Yes (Flip open only.)
• Voice Response accuracy - Decent. (From American viewpoint)
• Volume - Needs volume fix.
• Internet Connectivity speed - Edge!
• All 4 shortcuts changeable on home screen - Yes
• Languages - English and Russian
• Screen 3 - Yes
• Video - up to 352*288
• Run multiple java apps at same time - Yes
• Can install MPKG, Superman, etc.

• Realplayer - All equalizer presets WORKING!
Advantages:
• R541 Edge track firmware with ability to install Native programs (MPKG!)
• Run Multiple Java Apps
• Telnet and Samba start automatically
• 5 Skins (Black Ming, Classic Black, Atlantic, Onyx Black, Onyx White)

• Realplayer with equalizer presets working
• Daylight Savings Configuration
• Contacts, Recent Calls, RealPlayer, Camera, and Bluetooth without opening flip.

• Speakerphone works with flip closed
• Configurable time for holding the stylus
• New wallpapers
• New ringtones
Disadvantages:
• Volume Fix needs to be applied.
• Bug that happens when you try to view the list of Voice Commands, it does nothing, and kicks you back to the Home Screen.
• I had to do a Master Clear to get the World Time to work out of the box.
• The Ringer Styles Menu in Setup, once you get to where you choose which ringtone you want, the ringtones load
REALLY (+15 sec.) slowly.
Original Thread:
Here.
Download:
Here. Notes: It seems that if you change the stylus holding time to Medium or Fast it will speed up the OS.