ESP Miner v2.1.9: Overheat Mode, Improvements & Fixes

"Bitaxe firmware (esp-miner) version 2.1.9 has been released! Lots of bug fixes and improvements."

https://www.nobsbitcoin.com/esp-miner-firmware-v2-1-9/ 

 What happened to this version. Now I see the previous version on their github.