Gideon (and many helpers) have released Firmware 3.11 / Core 1.43 (Dated 2023-12-28) for the Ultimate 64, 1541 Ultimate-II, 1541 Ultimate-II+ and 1541 Ultimate-II+L. Here's the changes announcement:

Changes in 3.11, compared to 3.10i/j

Additions:
1. This version adds WiFi support for the Ultimate 64 and Ultimate 64 Elite.
Please read the manual on how to set up the ESP32 module.
https://1541u-documentation.readthedocs.io/en/latest/howto/wifi.html

2. JiffyDOS support for the built-in SoftwareIEC drive. This is a first step
to make the internal drive more usable. More effort needs to be done to
make the command set more compatible with CMD.

3. Assembly 64 integration. Many users use the offline version of the
great Assembly 64 online database, by running Fredrik's tool to copy
the content into folders onto a USB stick. Now, the Ultimate is the first
embedded ever system that integrates access to this online database! You
can now simply download and play titles directly from the internet on your
Ultimate device. Please read the manual about this here:
https://1541u-documentation.readthedocs.io/en/latest/howto/assembly.html

4. The Ultimate now supports a basic http daemon; also known as webserver.
This allows some simple files to be served from the Ultimate. This server
also implements a ReSTful API, which allows an external device to control the
Ultimate with standard web URLs. Read up on the API here:
https://1541u-documentation.readthedocs.io/en/latest/api/api_calls.html

5. On the Ultimate 64 it is now possible to isolate the serial bus from the
computer, which allows the Ultimate 64 to be used as external drives.
Look for "Serial Bus Mode" in the "Ultimate 64 Specific Settings".

Fixes:
Various small fixes, such as the telnet session closing upon mount, configuration
of the cartrdiges that serve VIC data from external ROM, quite a few fixes in
the emulated printer, configurable page margins, ... and so on.

Please visit the Ultimate 64 Official Firmware page if you'd like to make a donation to this great project!