# Navigation fault after upgrading SYNC 3.0 to 3.4 using CyanLabs Syn3 Updater **URL:** \ **Category:** CyanLabs Update Support\ **Tags:** eu, nav, pre-my20, oem, Syn3Updater, SYNC3, APIM\ **Created:** [14 August 2026 11:07 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551 "2026-08-14T11:07:02Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![alexandrumg](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/alexandrumg/32/17152_2.png) [@alexandrumg](https://community.cyanlabs.net/u/alexandrumg)\ **Post date:** [14 August 2026 11:07 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/1 "2026-08-14T11:07:02Z")
Hi, I have a Ford with a SYNC 3 Navigation APIM in the EU region. I upgraded the unit from SYNC 3.0 to SYNC 3.4 using CyanLabs Syn3 Updater. After the update I get the following message on the SYNC screen: “Navigation fault” “Navigation is not functioning properly.” The Navigation menu is present, but navigation is no longer functioning correctly. I have attached the XML files from before and after the update, as well as a photo of the error. Some information from the APIM interrogation: VIN: WF0AXXWPMAHK58252 APIM address: 7D0 APIM OS part number: JR3T-14G381-AY APIM has Navigation Region: Europe Installed navigation packages include: JL7T-14G424-BA JL7T-14G421-BA JL7T-14G422-BA JR3T-14G391-AE JR3T-14G423-AB One thing I noticed in the “after” XML is that the APIM still reports JR3T-14G381-AY as the OS/app package, which appears to correspond to SYNC 3.0.23219. I expected the APIM to report the SYNC 3.4 application package after the upgrade. Could you please check the attached before/after files and let me know whether the APIM configuration, navigation configuration or map packages are incorrect and what I need to do to restore navigation? Thank you! * * * **SYNC Region:** EU **Navigation Variant:** Nav **Manufacturer Year:** Pre MY20 **Install Type:** OEM **Old SYNC Version:** 3.0.23219 **New SYNC Version:** 3.4.23188 **Do you have a error message, if so what is it?** Navigation fault — “Navigation is not functioning properly.” **Update Method:** CyanLabs Syn3 Updater **Syn3 Updater Version:** 2.14.2.0 Stable **Syn3 Updater Documentation Read:** yes **Syn3 Updater Log File** ```no-highlight CYANLABS - SYN3 UPDATER - V2.14.2.0 Branch: Stable Operating System: Microsoft Windows 11 Pro (2009) PREVIOUS CONFIGURATION Version: 3.0.23219 Region: EU Navigation: False Install Mode: Auto-Detect (autoinstall) Install Mode Overridden: False My20 Protection Enabled: Disabled / Not MY20 DESTINATION DETAILS Mode: Drive Model: USB SanDisk 3.2Gen1 USB Device Size: 114.6GB FileSystem: exFAT Partition Type: MBR AUTOINSTALL.LST ; CyanLabs Syn3Updater 2.14.2.0 Stable - Autoinstall Mode - Enforced Downgrade EU [SYNCGen3.0_ALL_PRODUCT] Item1 = APPS - 4U5T-14G381-AN_1552583626000.TAR.GZ Open1 = SyncMyRide\4U5T-14G381-AN_1552583626000.TAR.GZ Options = AutoInstall FILES (1) 4U5T-14G381-AN_1552583626000.TAR.GZ (479.7MB) LOG [7/16/2026 12:12:27 PM] Selected Region: EU - Release: Enforced Downgrade - Map Version: Non Nav APIM [7/16/2026 12:12:27 PM] Install Mode: Auto-Detect (autoinstall) Forced: False [7/16/2026 12:12:27 PM] MY20 Protection: Disabled / Not MY20 [7/16/2026 12:12:27 PM] Formatting USB drive [7/16/2026 12:12:27 PM] Re-creating partition table as MBR and formatting as ExFat on selected USB drive [7/16/2026 12:12:34 PM] Checking Existing File: 4U5T-14G381-AN_1552583626000.TAR.GZ [7/16/2026 12:12:37 PM] Validated: 4U5T-14G381-AN_1552583626000.TAR.GZ (Skipping Download) [7/16/2026 12:12:37 PM] Preparing USB drive [7/16/2026 12:12:37 PM] Checking Existing File: 4U5T-14G381-AN_1552583626000.TAR.GZ [7/16/2026 12:12:37 PM] Copying: 4U5T-14G381-AN_1552583626000.TAR.GZ [7/16/2026 12:12:54 PM] Validating: 4U5T-14G381-AN_1552583626000.TAR.GZ [7/16/2026 12:12:56 PM] Copied: 4U5T-14G381-AN_1552583626000.TAR.GZ [7/16/2026 12:12:56 PM] Generating Autoinstall.lst [7/16/2026 12:12:56 PM] ALL FILES DOWNLOADED AND COPIED TO THE USB DRIVE SUCCESSFULLY! ``` ---
**Author:** ![warlock12118](https://community.cyanlabs.net/letter_avatar_proxy/v4/letter/w/e95f7d/32.png) [@warlock12118](https://community.cyanlabs.net/u/warlock12118)\ **Post date:** [14 August 2026 18:26 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/2 "2026-08-14T18:26:48Z")
You did a reformat with just the APP, you no longer have any maps installed. Hence the NAV fault. ---
**Author:** ![alexandrumg](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/alexandrumg/32/17152_2.png) [@alexandrumg](https://community.cyanlabs.net/u/alexandrumg)\ **Post date:** [14 August 2026 18:38 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/3 "2026-08-14T18:38:40Z")
Thanks for the clarification. Yes, I understand now. The sequence was: 1. I originally had a factory SYNC 3.0 Navigation unit. 2. I upgraded from SYNC 3.0 to SYNC 3.4 using Syn3 Updater. 3. The update completed successfully, but after the upgrade I got a **Navigation Fault**. 4. I then used Syn3 Updater’s troubleshooting/recovery options. It suggested a **Reformat** as the next action to try to recover the unit and avoid bricking it. 5. I performed the Reformat with **APP only**. 6. I now understand that this removed the maps, which explains the current Navigation Fault. My main question is about the **original Navigation Fault that happened immediately after the first 3.0 → 3.4 upgrade** , before I performed the APP-only reformat. What would you recommend I do now to properly recover the unit? Should I simply create another Syn3 Updater USB with **Navigation enabled** and perform a complete reformat/update including the required **APP + MAP + MAP\_LICENSE + VOICE/NAVIGATION** packages? This is my first time updating SYNC 3, so I don’t want to try another option that could potentially make the situation worse. I would appreciate guidance on exactly which settings/install mode I should use in Syn3 Updater for my factory EU Navigation APIM. I have attached the before/after XML files and my Syn3 Updater log if they are useful. Thank you for your help! ---
**Author:** ![warlock12118](https://community.cyanlabs.net/letter_avatar_proxy/v4/letter/w/e95f7d/32.png) [@warlock12118](https://community.cyanlabs.net/u/warlock12118)\ **Post date:** [15 August 2026 12:44 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/4 "2026-08-15T12:44:21Z")
Your first round was a reformat and you didnt select the right options. Do a reformat, make sure you select the correct maps for install. ---
**Author:** ![SFRANCO](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/sfranco/32/11005_2.png) [@SFRANCO](https://community.cyanlabs.net/u/SFRANCO)\ **Post date:** [15 August 2026 21:04 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/5 "2026-08-15T21:04:18Z")
I bet he didn’t read the instructions. ![|100%x100%](https://media4.giphy.com/media/v1.Y2lkPTc5MGI3NjExcGtoaXprdnRybTg5aXA3Yzlld3owenFqY215aWd2ZnVrazNkZWpvaCZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/l2JhIUyUs8KDCCf3W/giphy.gif) ---
**Author:** ![wiz043](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/wiz043/32/14863_2.png) [@wiz043](https://community.cyanlabs.net/u/wiz043)\ **Post date:** [17 August 2026 01:23 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/6 "2026-08-17T01:23:21Z")
And ensure that you do a master reset at the end. ---
**Author:** ![system](https://community.cyanlabs.net/letter_avatar_proxy/v4/letter/s/bcef8e/32.png) [@system](https://community.cyanlabs.net/u/system)\ **Post date:** [19 August 2026 01:24 UTC](https://community.cyanlabs.net/t/navigation-fault-after-upgrading-sync-3-0-to-3-4-using-cyanlabs-syn3-updater/27551/7 "2026-08-19T01:24:19Z")
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