There are several locations to receive firmware from. When in Cura I can install the latest firmware to 18.104.22.168. On the Lulzbot download page there is 22.214.171.124 linked: http://download.lulzbot.com/Software/Marlin/126.96.36.199/Marlin_TAZ5_SingleExtruder_188.8.131.52_193d1f804.hex
I can see also there is a 2.x firmware available: http://download.lulzbot.com/Software/Marlin/
What is this firmware for? Is it ok to test this with a TAZ 5?