Error upgrading bootstrap 3 theme for ojs 3.4

Hello, please we are having trouble trying to upgrade a bootstrap 3 child theme that is working well with ojs 3.3 to ojs 3.4.

After going through the release notebook for ojs 3.4, we tried to edit the of the child theme and replace the import statement with namespace and use statements (similar to the parent bootstrap3 theme).

However, uploading the theme through the gallery is not working and if uploaded through the file manager, the plugins page keeps loading indefinitely. We also tried to rename the file to themeplugin.php.

Is there a way to know which codes to replace in older bootstrap child themes to make them work in ojs 3.4 please?

Manually updated the bootstrap theme to fix the issue.

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