Update of theme to 15.0 version

Shopify Discussion

Topic summary

  • Issue: Updating to the latest Shopify theme version removes previously added custom code when previewing the new theme. The user asks how to update without losing these customizations.

  • Guidance: No automatic transfer of custom code is indicated. Recommended manual migration steps:

    • Duplicate the current theme and download its files as a backup.
    • Add/update to the new theme version in the library.
    • Compare old and new theme files and manually copy over custom code into the new theme.

  • Additional note: Another participant suggests checking the store’s backend and ensuring all official documentation was followed, but provides no concrete steps.

  • Outcome/status: No confirmed resolution in-thread. The practical action item is to perform a careful, manual code migration and consider a backend review if problems persist. Discussion remains open.

Summarized with AI on December 26. AI used: gpt-5.
1

Good afternoon! I would like to update my theme to the latest version, but when I add it to the library and open it for a preview, all the code that I added to the old version is missing. Is there any way to update without losing that code?

Thank you.

2

Hi @PeppePro02 . I think you need to manually add your custom code to the new theme. Duplicate the current them + download theme file > Update theme > Compare files and manually copy custom code to the new theme.

1 Like
3

Hi,

Need to check your backend. Hope you have followed all the documents properly