Earlier today, Apple released iPhone Firmware 3.1.3 and Dev Team responded with NOT TO UPDATE to keep your Jailreak and Unlock. Well, Muscle Nerd has recently posted a tweet on Twitter below:

UPDATE #1:

LOL iPhone 2G experimenters can go ahead & use yesterday’s redsn0w on today’s 3.1.3 just point it at 3.1.2 ipsw (2G only for now!)

UPDATE #2:

Update 2: [Don’t go near this if you have 3GS, newer ipt2G, or any ipt3G] Can confirm that this method works for iPhone 3G and iPod touch 1G too.  Don’t do it for iPhone 3G if you need an unlock though (really, don’t!).  For older iPod touch 2G, we’ll need a small (1-character) change in redsn0w source.

Keep checking back for more updates!