Correct, that will not work.
Plug and unplug the xt90s a thousand times and it will start being easier.
You need power from battery and a USB connection to program. USB will not power the esc.
I can put the loop key in series to the negative pole right? I heard some people putting it on the positive side.
Does it matter?
just put a big loop on the xt90 so you can put your finger in it and pull it our easily
Doesnât matter. It just interrupts the circuit.
I saw that! Awesome how much effort he/she put in! Sadly, thereâs no explanation why you canât plug your xt90s into a xt90 to xt 60 connector and use it as the loop key.
I really want to know why this doesnât work, since the magic about the xt90s is due to one side of it having a built in Resistor (AFAIK) which prevents the sparksâŚ
If I use it like this, doesnât it achieve the same effect? And why? 
The xt90 to Xt60 is just an extension to the terminals of the (AFAIK) non magic xt90
The XT90S is special because it is a 2 stage connector. The resistor hits first, letting power through slowly, (this only takes a fraction of a second to charge), then the main body of the connector hits, at which point voltage has been equalized by the initial resistor section and now full power can flow. Wiring a resistor to a switch would mean full power goes through the resistor, itâll blow in a second.
Is the issue here that you donât want to take off the XT-60 connector to put an XT-90 on? If so, rip that bandaid off.
just replace the xt60 on the picture with the xt90. No way around that. I find some of my xt90âs easier to plug in as some xt60.
The xt60 plugs in and out flawlessly however the xt90s needs so much force I need to use pliers
I watched an entire movie plugging the xt90 a thousand times.
What you could try is to pinch the prongs together. Very slightly! Also put something around not to damage the prongs.
@BillGordon this is the problem Iâm having
When I have this mounted to my enclosure, or just having it on the outside for the beginning, I wonât get this on and especially not off, as I need pliers at the moment 
So when I plug it off it might just mess everything up
You need something that offers more pull force. Either a soldered loop of thick gauge wire you can hook a finger through or something like this handle Linny made. Simply pinching it between your fingers is not enough.
It will be a lot easier once the other end is mounted and you have a cable to grab hold of
exactly. Something like this makes it a ton easier.
I keep mine simple but wouldnât mind doing it like those from above.
I could print you a cover if you want. Doesnât take much effort. You just need to promise to use the xt90 instead xt60 ^^
@b264 does his loops with braid and then coats them nice and thick with conformal. Maybe heâll share a photo with us.
https://www.amazon.com/gp/product/B07DJ7QHQM/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
this one is a USB-C but they have micro USBâs as well. also the tips/connectors can be removed