If you've only edited theme nothing should break. From that link you provided I have no clue what you modified in core. I saw only many modifications in Atom-X theme.
Anyway I always say that modifying core files is not a very smart idea. Since v9.10.00 we have auto updates system so modifying will be even worse. Because updater just replace all files and runs update scripts (upgrade/ folder). Btw in v9 you can do many modifications on theme level.
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