The latest UM2(+) firmware is included with Cura and had its last update with the Cura 3.3 release in April 2018.
There is also a beta version which fixes some bugs but never made it to an official release:
These are the changes compared to the v3.3 Cura release:
Copied stepper module fixes from UM3 / Open source Marlin project. These fixes solve the problem where during fast movements you sometimes heard a loud tick sound like some mechanical hiccup was occurring. - Fix: the multiply routine could have an overflow, solved by adding a 24x32-bit routine - Fix: ensure the stepper interrupt triggers immediately again when it takes too long. Improve material import: - Fix: a material name length of 8 (or more) would crash the printer. Now consistently allow a length of 8 characters everywhere. - Fix: illegal values for the material retraction-length and retraction-speed are now set to default values. - Change: Improve error handling for very large positive or negative numbers. Other changes: - New: added Tough PLA (TPLA) material profile. - Fix: retract at end of print. Contributed by TinkerGnome. - Fix: another bug with retraction at end of print. If we were already retracted (G10), then we were retracting too much. - Fix: M117 was missing a character when printing via USB. Cherry-picked from UMO repository. Contributed by AmedeeBulle - Change: Changing material during a print is made 15 to 30 seconds faster by removing an unneeded filament heat-up (the filament is already hot). - Returning from the preset menu did not set focus on the preset menu (1 off) - Several trivial beautifications.
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Smithy 1,141
The UM2 firmware wasn't updated for a long time, I would say the latest is 3 years old or so.
The Firmware is bundled with Cura so when you connect the printer via USB you can update it, no need to download it first.
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