I didn't see firmware for BEFSR41W Version 2 on the Linksys site. I saw a version 1, and here's the release notes for the newest firmware for that version.

Quote:

The Linksys Group, Inc.

Current Firmware : Version 1.1 Revision 17
Product PartNo : BEFSR41W

Ver #. Description
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1117 1. Added support for Netscape 4.x

1116 1. Add RAS login
2. IP/TCP/UDP filter
3. RIP-II
4. Send LOG file by email
5. DNS relay.
6. SNMP v2c, v3.0 support
7. 8Mbps throughput
8. Wireless Access Control
9. PRISM v3.0 support (FW ver1.3.5)
10. PPTP connection for Europe
11. Support Multi IPsec (ESP, Tunnel-mode) pass-through
12. Fixed upgrade bug
13. Fixed remote management saving configuration
14. Remove keep alive period time field on index.htm
15. Change default value to Keep Alive
16. Supports LAN PC ping device's WAN port
17. Added MTU setting feature
18. UPnP is disabled by default
19. Fixed HELP button link in SETUP page
20. Add note for MTU setting in FILTER page
21. SNMP is disabled by default in PORT FORWARDING page


1021 First Release
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So 8Mbps throughput is probably all this modem will do.