1) which is better, NEW 3DS or the NEW 3DSXL? i wanted to get the MH4 bundle, does it comes both in non-xl and xl versions?
There is only the New3DSXL. There is no New3DS like the old models. Just XL. So N3DSXL.
2) i heard some NEW 3DS have a better screen, is there a way to know how to get one with the better screens?
Uh... no comment. Just don't believe the hype. But if anyone asks why you want to check the UPC on the box just tell them "Certain models have a better screen" and that should shut them up.
3) i would love to save the money on the charger, can i charge the 3DS using an USB cable like the one i use to charge my smartphone?
Certain retailers sell a USB>3DS cord which can be used to charge on any PC or USB power adapter. Or just buy a power adapter. The USB cords are kind of short compared to the gray nintendo ones.
This is what you're looking for:
http://www.amazon.com/USB-Charger-Cable-Nintendo-3DS-DS/dp/B0099HP4OC
Try to find one from EU. It only charges. This does NOT hack the system. That's something else... which you won't need to know for now.
4) will i be forced to update firmware as soon as i connect to the internet?
Um, it'll ask, but don't. Especially if you want to use a Gateway. The moment your system is above 9.2 you can't install Gateway 3DS on your system.
5) someone here before told me that these model of the MH4 bundle are supposed to be on 9.2
Check the UPC codes. Got bad news, most of the limited editions and bundled systems are more recent and probably have above 9.2. Either check your UPCs or try to avoid the limited editions and bundles.
QW4013 (MH4 UE) - Confirmed
QW4012 (MH4 UE) -Confirmed
QW4011 (Monster Hunter 4 ultimate edition) - Confirmed
As poster above said, those are US UPC codes. Scroll down to the EU list and find the right ones for you.
Make sure you scroll down to the EU versions. Here's the UPC list:
https://gbatemp.net/threads/n3ds-xl-firmware-by-version-number.381479/
in case they don't have the bundle, which other model are supposedly on 9.2, where can i find the model number anyway?
Make sure you scroll down to the EU versions. Here's the UPC list:
https://gbatemp.net/threads/n3ds-xl-firmware-by-version-number.381479/
Are you wanting to use Gateway 3DS? If yes, then 9.2 or below is essential.
To install the Gateway 3DS you will also need Cubic Ninja or Zelda-OOT. Cubic Ninja is better and cheaper.
Sky3DS only plays games. No homebrew or ROM dumping or firmware backup.
Try to get a 64-128GB micro SD card for the N3DSXL. The Gateway or Sky3DS you will want to make sure you get a 32GB Class 10 microSD. Try to avoid any micro SD that isn't Class 10, this means UHS-1 or UHS-3 cards.
Decisions, decisions, decisions...
Decide what you want to do, then worry about what you'll need to do it. If you just want a New3DSXL to play MH4U and you don't want anything special, then you won't have to worry about much. Powersaves Pro will be plenty for cheating and savegame backup.
If you want more, first consider the Gateway 3DS but if all else fails, the Sky3DS will work on any firmware. It just doesn't have all the bells and whistles of the Gateway.
SO YOU NEED:
N3SDXL (9.2 or below for Gateway)
AC Adapter / USB adapter
64-128GB mSD Class 10 (try to avoid UHS, but it -MUST- be at least class 10)
Easiest option:
Powersaves Pro (highly recommended)
Best option:
Cubic Ninja Game Cartridge (needed for Gateway)
Gateway 3DS
If you just want to update firmware and not install Gateway but want to play 3DS games:
Sky3DS
Powersaves Pro
Hope that helps. Again, decide what you want, THEN find what you'll need. Don't go wasting your time and money and end up getting the wrong thing.