A new version of the firmware for the Ultimate-64 / U2+ / U2 by Gideon is released.

U64 – Differences with previous official release V1.0B:

• Based on Ultimate-II+ firmware Version 3.4
• NTSC mode has been added. The switch can be found in the U64 Specific Settings menu
• Added rudimentary support for USB Floppy disks (not completely done yet; as removal of floppy is not yet detected)
• USB problems with low/full speed devices fixed; no more bus hang-ups in these cases. (No full HID support just yet..)
• VIC collision problem fixed.
• Improved 1541 compatibility; weak bit areas and floppy speed zones are now properly supported.
• LED Strip support.
• Various improvements ‘under the hood’

U2+ – Differences with previous official release V3.3a:

• Added rudimentary support for USB Floppy disks (not completely done yet; as removal of floppy is not yet detected)
• USB problems with low/full speed devices fixed; no more bus hang-ups in these cases. (No full HID support just yet..)
• Improved 1541 compatibility; weak bit areas and floppy speed zones are now properly supported.
• Various improvements ‘under the hood’

U2 – Differences with previous official release V3.2:

• The USB2LAN problem is now fixed. This bug took me over 50 hours to find and fix.
• Improved 1541 compatibility; weak bit areas and floppy speed zones are now properly supported.
• All other under the hood fixes that were done for U2+ and U64 that apply for U2 are backported to the U2 as well.

Download:

• U64/Ultimate-64 v1.10 - U2+/U2 v3.4 Firmware (692)

source: ultimate64.com