Just Discovered my 3ds is Region Changed, how do i know which is the original region?

[reef wyvern]

Disclaimer: English is not my first language.

Right, so let me explain it from the Start, bought my 3ds from Aliexpress like a year ago, it had some problems with its luma install that i quickly solved, then i heard about Pokémon Bank turning Free and the Eshop closing, never thought about using Pokémon Bank til recently cuz I wasn't done playing any of the games. So today, after finally finshing Ultra Sun, i tried using it, and it gave me an error 005-5958, when i looked this code up on the internet people were saying it was because of region changing, i want to fix it, so i can transfer my pokémon to home safely, but i don't know how to check which is my original Region.

[lilac lodge]

check what 2nd letter of the serial (on the back or card slot) is.
but you probably need soap transfer to fix it

[reef wyvern]

Sorry for the delay, busy days, If the serial is the one under a bar code, it is "W"

What is Soap Transfer?

[crimson gyro]

Something only about 3 people can do, to talk to Nintendo servers and remove the eshop region lock on your system long enough to change regions

[lilac lodge]

Then the original region should be U, what's your current region?

[reef wyvern]

It is Europe

[reef wyvern]

oof, is there anyway one can learn how to do It?

[lilac lodge]

Ok, you have two option, one is change it (back) to us (if feasible to you)
Another is do soap transfer to fix it, which as said above, ask at nintendo homebrew server
(I can do it, but personally still prefer to handle there)

[lilac lodge]

You can, but you need another console(s) that you don't really care about to do this fix