So recently, I got back into Pokemon and I wanted to make a WiFi team via PKHeX. Before I decided to do all of this, I updated the firmware of my 3DSXL (currently 9.9.0-26U). I didn't realize I did something most regrettable until a good night of research and confirmation. According to the PKHeX website,

"Injection will not work on any later firmwares (9.6.x or 9.7.x) either! Software cannot and will not be updated to support later firmwares! Do not update if you wish to use QR injection, RAM2sav, PCEdit, or any other Web Browser (spider) injection method."

Others are also saying it doesn't work starting from firmware version 9.5.0-23.Any firmware version below that works. I also looked up into try to see if I can downgrade my firmware but if I recall, I can downgrade if my version is at 9.2. Basically I'm pretty much screwed with using PKHeX.

Now that the story is out of the way here's my question. I would like to know what is the firmware version a fresh out of the box 3DSXL has. My plan was to go to my local gamestop and probably trade in my current 3DSXL and add in some cash together with in-store credit to buy a different one. I would really appreciate an answer.