ACK is a forked version of the VESC Tool… pretty much a reliable tried and true version of the firmware, and a great place to start your journey into VESC firmware, and is pretty much not going to be updated or supported anymore… It’s where I started, and lots of peeps still run it…
@mmaner wrote a great tutorial here…
I no longer use it and moved most of my boards over to VESC Tool and FW 5.~
Is there a reason why you don’t wish to use FW 5.~? the only issue I’ve found is poor thermal motor filtering, and that’s being worked on at the present in FW5.02
+plus it’s not like you’re married to a FW, you can easily try FW out and if your motor, ESC, etc. are unhappy you can swap FW
good luck