LST_ERR05

Ford SYNC 3 Support
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12

3.4.23188 is probably the least buggy since 3.4.21265. And has the rwdata bug fix.

Maybe you should follow this guide and see if it helps…

Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4 - Ford / Guides - CyanLabs Official Community