Version 1.4.3 is based on Google’s Platform Tools from late 2015/early 2016. This was a golden era—post-Android 5.0 Lollipop but before Google started aggressively changing Fastboot syntax. This version is known for:
Common for Magisk rooting. Assuming you have a patched image named boot.img. minimal adb and fastboot 143 setup hot
fastboot flash boot boot.img
A command prompt window will open with C:\Program Files (x86)\Minimal ADB and Fastboot> as the working directory. Version 1