iPhone 3GS

Submitted by Admin on January 12, 2018, 9:29 am PST 566
Specifications and info
Brand 
Apple
Device 
iPhone 3GS
Model 
A1303 and A1325
Release date 
June, 2009
Hardware
Chipset 
32bit - Samsung S5PC100
CPU processor 
600Mhz Single-Core ARM Cortex-A8
RAM memory 
256MB SDRAM
Forum
Official signed firmwares update.
1. Connect your iPhone or iOS device to your computer.
2. Select the device in iTunes online or downloaded version of iTunes.
3. On a Mac, hold down the “Option” key and then click on “Update”.
4. On a Windows PC, hold down “SHIFT” key and then click on “Update”.
5. Select the IPSW file you downloaded and click “Choose”.
6. Let the iOS device update as usual.

Not official unsigned firmwares with Jailbreak and so on.. Use 3uTools and special firmwares for the tools. That's the only way to downgrade it.
any part of file name
Release date File name Size Signed Download Count MD5 hash
11/08/2011 iPhone2,1_5.0.1_9A405_Restore.ipsw 684.91 MB Download 299 812a3dd8c6eb849cec62d16ed7e20ac9
02/16/2013 iPhone2,1_6.1.2_10B146_Restore.ipsw 784.5 MB Download 251 96daf1876e35399dc6954db998e1463c
03/14/2013 iPhone2,1_6.1.3_10B329_Restore.ipsw 784.87 MB Download 251 fa4605a61404b45c2087a360b692d531
01/12/2018 3uTools_v2.19_Setup.zip 66.45 MB Download 608 c4cca189a48945798f85d59e58a5f667
09/03/2010 iPhone2,1_4.1_8B117_Restore.ipsw 382.02 MB Yes Download 217 e07bee3c03e7a18e5d75fcaa23db17b5
02/22/2014 iPhone2,1_6.1.6_10B500_Restore.ipsw 784.85 MB Yes Download 236 1b6a0a0c9701d3762be7c4e90799c0b5
06/10/2009 iPhone2,1_3.0_7A341_Restore.ipsw 297.83 MB Download 217 7fbfdd916e3f6912da6541596cb96d72
06/17/2010 iPhone2,1_4.0_8A293_Restore.ipsw 377.92 MB Download 241 f9819ad9a52324ac6f10e4a0ea581cbd
03/03/2011 iPhone2,1_4.3_8F190_Restore.ipsw 423.2 MB Download 210 87ebb9b2c025fb5f87a4cab0631b1547
03/01/2012 iPhone2,1_5.1_9B176_Restore.ipsw 687.03 MB Download 224 51e253431b1080cbbb5073efc87b1bb3