yes you can i downloaded to 4.5 from 10.3 i tryed 2.0 but i softbricked my 3ds & i had to use recovery mode
i used the new sysupdater (theres plenty of guides on here)
i also bought one & it was firmware 2.1.0-4E
https://gbatemp.net/threads/are-all-old-3ds-hackable.404145
i think there was a comment reply from an argos rep saying they were a batch from 2011 on the argos website
EDIT
spelling mistake
i pick mine up in the morning but someone in another thread has allready got theres today & it was on firmware 2+
https://gbatemp.net/threads/uk-exploitable-9-2-3ds-consoles-for-%C2%A369-99-in-argos.404204/
I feel like school, back when I was actually in school, was more entertaining though, because of how much I get to interact with people, hang out with friends, and other stuff like that. All I get to talk to at work is my boring coworkers lol