Shark speed controllers
You usually have to start setting these types of ESCs with throttle at full, then back to center (for forward and rev) or bottom for fwd only, (if they are a F/R type) then unplug power, then TX on, full throttle, power on then set choices (beep numbers) in the first menu by throttle back quickly to center or bottom (whatever was initially set), back to top after confirm beep, next menu section opens and you repeat for each item you want to change.
Both menus keep cycling when you are in them, so if you miss what you want, it will come round again, ( helps to have an enlarged copy of the instructions handy and follow it as you go). when you have everything you want set and confirmed, unplug the power. Now when you want to start normally, put the stick to the center (or bottom if initially set there) turn on TX, plug in power and you should be good to go.
I look at these menus like a tree,- sort of trunk, branches and leaves, - 1 -up the trunk, 2-out on the branch, 3 - into the leaves and away. Everyone sees things a different way, so you have to find a thought process that clicks with you.
They are simple but time consuming, a program card is a lot quicker😁
JB