Is ipsw 4.2.1 better than ios 4.2.1 for my iphone 3g?

I'm downloading ipsw 4.2.1 for my iphone 3g which's version is 4.2.1 i want to know if its a is a waste of time, a hazard or an advantage, please explain furthur

Added (1). Yh and if they are the same is it possible to get ipsw 5.1.1 for my iphone 3g

They are indeed the same thing and unfortunately, the iPhone 3G's latest software is iOS 4.2.1.

  • Why can't' I download IOS 6.1.2 IPSW file I'm trying to downgrade my iphone from IOS 6.1.3 to 6.1.2 but whenever I try to download a IPSW file instead of downloading it opens up another tab that loads forever or it will make it seem like its going to download but instead it makes the screen loads forever also. I've seen other people download IOS IPSW files without any problems but when I do it I get a screen that loads endlessly. I'm trying to jailbreak my phone but first I need to downgrade it.
  • Where to download Iphone 4 cdma 6.0 ipsw? I need this software. I try to use the direct link on http://www.felixbruns.de/iPod/firmware/ but it says wating for appldnld.apple.com but it just won't load, I've tried like 10 different sites. Could anyone give me a good link?
  • Where to download iOS 6.0.1 IPSW firmware direct links? I want to download iOS 6.0.1 ipsw firmware for iPhone 3gs, 4, 5, 4s, iPad 2, 3 and ipod touch 3g, 4g, can any one help
  • Is iOS 7 better than iOS 6.1.3? Some people who jail broke their iPhones and iPods say its really good and better. Then other people are saying that its bad and they wouldn't get it and it changes everything should I download it when it is released?