This is the process I used to upgrade an iPhone 3Gs running IOS 4.1 baseband 06.15.00 to IOS 5.0.1 while preserving the baseband and the carrier unlock.<\/p>\n
Software installed\/downloaded:<\/p>\n
OS: MacOS Lion 10.7.2 I plugged the phone into my computer and backed up from iTunes by right mouse clicking on the phone and selecting “Backup”.<\/p>\n I downloaded the redsn0w application and the IOS install into a folder called JB.<\/p>\n I unzipped the redsn0w_mac_0.9.10b1.zip and executed redsn0w.app from the redsn0w_mac_0.9.10b1 folder.<\/p>\n Clicked Extras.<\/p>\n Clicked Custom IPSW and browsed to the JB folder where I downloaded the iPhone2,1_5.0.1_9A405_Restore.ipsw from Apple.<\/p>\n Since I had an original 3Gs, I selected “No” on the “Will this custom IPSW be used on a newer (fixed) version of the iPhone3GS?”.<\/p>\n This created a custom NO_BB_OLDROM_iPhone2,1_5.0.1_9A405_Restore.ipsw file that will not attempt to update the baseband when IOS 5.0.1 is restored.<\/p>\n Once created, I needed to put the phone in DFU mode. For some reason, I had trouble using the method I had used before. This is what I did this time:<\/p>\n With device powered on,unlocked and connected via the USB cable with iTunes running: Then, I was able to hold “alt\/option” and click the “Restore” button in iTunes.<\/p>\n This allowed me to browse to the custom IPSW: NO_BB_OLDROM_iPhone2,1_5.0.1_9A405_Restore.ipsw.<\/p>\n This installed IOS 5.0.1 on the phone and preserved the baseband (06.15.00) with the applications and settings restored.<\/p>\n Once up, the phone still needed to be jailbroken and unlocked.<\/p>\n I closed iTunes, and brought up Redsn0w again. I needed to point redsn0w to the unchanged iPhone2,1_5.0.1_9A405_Restore.ipsw file. This time, I chose Jailbreak. The only option that I had selected was “Install Cydia”.<\/p>\n After rebooting and verifying the Cydia icon is installed, I needed to unlock the phone.<\/p>\n I launched Cydia and clicked on Manage and then Sources.<\/p>\n Then, I added the Ultrasn0w repository by clicking “Edit” and “Add”. Then, I added the repository: http:\/\/repo666.ultrasn0w.com. Note: this took me quite a few attempts on the 27th, due to server load some where along the line. Eventually, I was able to get the repository added.<\/p>\n Once added, I was able to search for and install Ultrasn0w.<\/p>\n I rebooted and the phone was updated, jailbroken and unlocked.<\/p>\n","protected":false},"excerpt":{"rendered":" This is the process I used to upgrade an iPhone 3Gs running IOS 4.1 baseband 06.15.00 to IOS 5.0.1 while preserving the baseband and the carrier unlock. Software installed\/downloaded: OS: MacOS Lion 10.7.2 iTunes: 10.5.2 redsn0w_mac_0.9.10b1.zip iPhone2,1_5.0.1_9A405_Restore.ipsw I plugged the phone into my computer and backed up from iTunes by right mouse clicking on the [&hellip<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[229,228,231,92,206,230],"class_list":["post-642","post","type-post","status-publish","format-standard","hentry","category-documentation","tag-06-15-00","tag-3gs","tag-ios-5-0-1","tag-iphone","tag-unlock","tag-untethered"],"share_on_mastodon":{"url":"","error":""},"_links":{"self":[{"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=\/wp\/v2\/posts\/642","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=642"}],"version-history":[{"count":8,"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=\/wp\/v2\/posts\/642\/revisions"}],"predecessor-version":[{"id":650,"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=\/wp\/v2\/posts\/642\/revisions\/650"}],"wp:attachment":[{"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=642"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=642"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jim-zimmerman.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\niTunes: 10.5.2
\nredsn0w_mac_0.9.10b1.zip<\/a>
\niPhone2,1_5.0.1_9A405_Restore.ipsw<\/a><\/p>\n
\nHold the Power and Home buttons.
\nWhen the screen goes black, count to 2.
\nThen, release the Power button, and hold the Home button for 10 \u00e2\u20ac\u201c 15 seconds.
\niTunes came up and displayed that it was in recover mode. I tried restoring my custom IPSW from here but I kept getting a 1600 error. So, once I had in recover mode, I fired up Redsn0w again and went into Extras and clicked on “Pwned DFU”.
\nThis put it in DFU mode quickly.<\/p>\n