# SYNC 3.4 Downgrade not working

**URL:** <https://community.cyanlabs.net/t/sync-3-4-downgrade-not-working/7294>\
**Category:** SYNC 3 Support\
**Tags:** my20, non-nav, oem-replacement, na, SYNC3, APIM\
**Created:** [29 December 2022 04:06 UTC](https://community.cyanlabs.net/t/sync-3-4-downgrade-not-working/7294 "2022-12-29T04:06:33Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![F150Chief](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/f150chief/32/14712_2.png) [@F150Chief](https://community.cyanlabs.net/u/F150Chief)\
**Post date:** [29 December 2022 04:32 UTC](https://community.cyanlabs.net/t/sync-3-4-downgrade-not-working/7294/2 "2022-12-29T04:32:47Z")

</div>

You have a NON-NAV APIM which has only 8GB of memory, so you need to make room for any type of modifications by deleting Gracenotes. Once you have that done, the process will likely work. See the tutorial…  
[Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4 - Ford / Guides - CyanLabs Official Community](https://community.cyanlabs.net/t/tutorial-sync-3-4-non-nav-apim-failure-to-update-to-newer-version-sync-3-4/1984)

This applies to upgrading or downgrading thru autoinstall. Only perform the Gracenotes deletion and the downgrade of the version.

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_[View the full topic](https://community.cyanlabs.net/t/sync-3-4-downgrade-not-working/7294)._