Ihave a 3GS phone.
I do not know which version of software was it last properly
Now stuck in recovery mode How to do it? Maybe it was unlocked I don't know The itunes restore not working .allways error 3194, 20, -1 etc
I've tried many IPSW versions
Please write me step by step guide how can i to restore my phone
I wrote this with the help of google I can not pay the exact.....

My restore log:



2013-02-26 11:34:36.109 [1608:664]: restore library built Dec 21 2012 at 16:17:03
2013-02-26 11:34:36.109 [1608:664]: iTunes: iTunes 10.6.3.25
2013-02-26 11:34:36.109 [1608:664]: iTunes: Software payload version: 10B146 (option key)
2013-02-26 11:36:14.187 [1608:bfc]: iTunes: Specifying UOI boot image
2013-02-26 11:36:14.187 [1608:bfc]: requested restore behavior: Erase
2013-02-26 11:36:14.187 [1608:bfc]: requested variant: Erase
2013-02-26 11:36:14.187 [1608:bfc]: *** UUID 509E6AF9-D338-3044-825C-457BFFEF7AD3 ***
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: withApTicket is True
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "RestoreLogo" Digest = "<CFData 08E73950 [01788078]>{length = 20, capacity = 20, bytes = 0x3393e4d2763260506902faa02bb19dc8c8b2082f}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "RestoreDeviceTree" Digest = "<CFData 08E856A8 [01788078]>{length = 20, capacity = 20, bytes = 0x7736a170388fb0cbe649adc7d412575c2b247c6a}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "RestoreKernelCache" Digest = "<CFData 08E5B628 [01788078]>{length = 20, capacity = 20, bytes = 0x36ed8412a30ace1479d01668f21f10aa7603f150}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "RestoreRamDisk" Digest = "<CFData 08E177E0 [01788078]>{length = 20, capacity = 20, bytes = 0x0f6d4917cb665be8964c6889e2c42c1479efd2d4}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "iBEC" Digest = "<CFData 08E28EF8 [01788078]>{length = 20, capacity = 20, bytes = 0xf3ffe56a1ee8a97b60719a764cbb122b6dc69c34}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "iBSS" Digest = "<CFData 08E6C8C0 [01788078]>{length = 20, capacity = 20, bytes = 0x4cfee9a0507313fb4343b225292b6b5fc38a9726}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "KernelCache" Digest = "<CFData 08E29198 [01788078]>{length = 20, capacity = 20, bytes = 0x36ed8412a30ace1479d01668f21f10aa7603f150}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryLow1" Digest = "<CFData 08E8DD28 [01788078]>{length = 20, capacity = 20, bytes = 0xf725d16a6c0b8d5803ebf5c78258954b3e2fc6f3}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryLow0" Digest = "<CFData 08E17580 [01788078]>{length = 20, capacity = 20, bytes = 0x107493423485f7e70340dfb2c1cfb761cda9c3ac}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "LLB" Digest = "<CFData 08E2CEC8 [01788078]>{length = 20, capacity = 20, bytes = 0x4f09f96bdc4b9db9be39a39fe90171b9a00a4119}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "iBoot" Digest = "<CFData 08E293F8 [01788078]>{length = 20, capacity = 20, bytes = 0xd3b7e07b7fc6b7d08ebd2f76fe5fbfe611c13b64}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "DeviceTree" Digest = "<CFData 08E850D0 [01788078]>{length = 20, capacity = 20, bytes = 0x7736a170388fb0cbe649adc7d412575c2b247c6a}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryCharging1" Digest = "<CFData 08E2D4C0 [01788078]>{length = 20, capacity = 20, bytes = 0x208f1ae0e689f306c8b6b999dabab98a85f5e482}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryCharging" Digest = "<CFData 08E45088 [01788078]>{length = 20, capacity = 20, bytes = 0xb5ba784a7eaab95e7551f6f2f4aa2bca473d49ce}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "AppleLogo" Digest = "<CFData 08E1E608 [01788078]>{length = 20, capacity = 20, bytes = 0x3393e4d2763260506902faa02bb19dc8c8b2082f}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryPlugin" Digest = "<CFData 08E1B630 [01788078]>{length = 20, capacity = 20, bytes = 0x5eea711a0063eaf53ccb6186197c03d86a26ce46}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryFull" Digest = "<CFData 08E16CD0 [01788078]>{length = 20, capacity = 20, bytes = 0x0728f6e1ca04f6f0625a373053e9ed4a0cc7b899}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "BatteryCharging0" Digest = "<CFData 08E17DB8 [01788078]>{length = 20, capacity = 20, bytes = 0xb6905bb6573368eb39c2717e6fc6774747633ead}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: personalizing "RecoveryMode" Digest = "<CFData 08E9BD58 [01788078]>{length = 20, capacity = 20, bytes = 0x65d332672af1be0782ce59cf085b3103e8728886}"
2013-02-26 11:36:14.203 [1608:bfc]: amai: _AMAuthInstallBundleCreateServerRequestDictionary: using UniqueBuildID <CFData 08E9B8F0 [01788078]>{length = 20, capacity = 20, bytes = 0x16c8202f9f54546c0f0bc02482d1872fb9667811}
2013-02-26 11:36:14.203 [1608:bfc]: amai: AMAuthInstallRequestSendSync: SSO function returned NULL, SSO disabled.
2013-02-26 11:36:15.125 [1608:bfc]: amai: tss_submit_job: HttpQueryInfo returned 200
2013-02-26 11:36:15.125 [1608:bfc]: amai: tss_submit_job: error from server=94 (This device isn't eligible for the requested build.)
2013-02-26 11:36:15.125 [1608:bfc]: amai: kAMAuthInstallRequestCacheLocalizedTssError: cached server error text: (3194) This device isn't eligible for the requested build.
2013-02-26 11:36:15.140 [1608:bfc]: amai: AMAuthInstallRequestSendSync: failed tss submission: This device isn't eligible for the requested build.
2013-02-26 11:36:15.140 [1608:bfc]: amai: AMAuthInstallApCreatePersonalizedResponse: server request error: This device isn't eligible for the requested build.
2013-02-26 11:36:15.140 [1608:bfc]: amai: AMAuthInstallBundlePersonalizePartial: failed to create ap ticket
2013-02-26 11:36:15.140 [1608:bfc]: failed to personalize the restore bundle: This device isn't eligible for the requested build.
2013-02-26 11:36:15.140 [1608:bfc]: AMRAuthInstallDeletePersonalizedBundle
2013-02-26 11:36:15.140 [1608:bfc]: AMRecoveryModeDeviceCopyAuthInstallPreflightOption s: failed to personalize bundle
2013-02-26 11:36:15.296 [1608:664]: iTunes: Restore error 3194
2013-02-26 11:36:15.375 [1608:664]: AMRAuthInstallGetLocalizedStringForServerError: no cached text for tss error code 3194
2013-02-26 11:36:15.593 [1608:dc0]: WinAMRestore::OnInterfaceRemoval: \\?\USB#VID_05AC&PID_1281#{ED82A167-D61A-4AF6-9AB6-11E52236C576}\IB0000#312c97f6
2013-02-26 11:36:15.593 [1608:dc0]: WinAMRestore:rocessDevNodesChanges: device: 0x0677da80, notify: 2, connected: 1
2013-02-26 11:36:15.593 [1608:dc0]: AppleDevice::NotifyDisconnect: IBOOT, IBOOT \\?\USB#VID_05AC&PID_1281#{ED82A167-D61A-4AF6-9AB6-11E52236C576}\IB0000#312c97f6, inst: 0x677da80
2013-02-26 11:36:15.593 [1608:dc0]: IBOOT, DFU \\?\USB#VID_05AC&PID_1281#{B8085869-FEB9-404B-8CB1-1E5C14FA8C54}\0000#312c97f6, inst: 0x677da80
2013-02-26 11:36:15.625 [1608:dc0]: WinAMRestore::OnInterfaceRemoval: \\?\USB#VID_05AC&PID_1281#{B8085869-FEB9-404B-8CB1-1E5C14FA8C54}\0000#312c97f6
2013-02-26 11:36:15.625 [1608:dc0]: WinAMRestore:rocessDevNodesChanges: device: 0x0677da80, notify: 2, connected: 0

Google or search please before you post. If you had spend 30 seconds searching your error (3194) you'd have found your solution. You're trying to downgrade to an unsigned version of iOS without SHSH. If you have SHSH, you can use TinyUmbrella to downgrade. If you don't, you cannot downgrade and you can only restore to a signed version of iOS. Google 'SHSH' or look at the SHSH link in my signature for more information.