diff --git a/custom_components/bahmcloud_store/core.py b/custom_components/bahmcloud_store/core.py
index b4ab03c..4e7c5e6 100644
--- a/custom_components/bahmcloud_store/core.py
+++ b/custom_components/bahmcloud_store/core.py
@@ -20,7 +20,7 @@ from homeassistant.helpers import issue_registry as ir
 from homeassistant.util import yaml as ha_yaml
 
 from .storage import BCSStorage, CustomRepo
-from .providers import fetch_repo_info, detect_provider, RepoInfo, fetch_readme_markdown
+from .providers import fetch_repo_info, detect_provider, RepoInfo, fetch_readme_markdown, fetch_repo_versions
 from .metadata import fetch_repo_metadata, RepoMetadata
 
 _LOGGER = logging.getLogger(__name__)
@@ -415,6 +415,23 @@ class BCSCore:
             default_branch=repo.default_branch,
         )
 
+    async def list_repo_versions(self, repo_id: str, *, limit: int = 20) -> list[dict[str, str]]:
+        """List installable versions/refs for a repo.
+
+        This is used by the UI to allow selecting an older tag/release.
+        """
+        repo = self.get_repo(repo_id)
+        if not repo:
+            raise BCSInstallError(f"repo_id not found: {repo_id}")
+
+        return await fetch_repo_versions(
+            self.hass,
+            repo.url,
+            provider=repo.provider,
+            default_branch=repo.default_branch,
+            limit=limit,
+        )
+
     def _pick_ref_for_install(self, repo: RepoItem) -> str:
         if repo.latest_version and str(repo.latest_version).strip():
             return str(repo.latest_version).strip()
@@ -913,13 +930,14 @@ class BCSCore:
             self.signal_updated()
             return {"ok": True, "repo_id": repo_id, "removed": removed, "restart_required": bool(removed)}
 
-    async def install_repo(self, repo_id: str) -> dict[str, Any]:
+    async def install_repo(self, repo_id: str, *, version: str | None = None) -> dict[str, Any]:
         repo = self.get_repo(repo_id)
         if not repo:
             raise BCSInstallError(f"repo_id not found: {repo_id}")
 
         async with self._install_lock:
-            ref = self._pick_ref_for_install(repo)
+            requested = (version or "").strip()
+            ref = requested if requested else self._pick_ref_for_install(repo)
             zip_url = self._build_zip_url(repo.url, ref)
 
             _LOGGER.info("BCS install started: repo_id=%s ref=%s zip_url=%s", repo_id, ref, zip_url)
@@ -1039,9 +1057,9 @@ class BCSCore:
                     raise
                 raise BCSInstallError(str(e)) from e
 
-    async def update_repo(self, repo_id: str) -> dict[str, Any]:
+    async def update_repo(self, repo_id: str, *, version: str | None = None) -> dict[str, Any]:
         _LOGGER.info("BCS update started: repo_id=%s", repo_id)
-        return await self.install_repo(repo_id)
+        return await self.install_repo(repo_id, version=version)
 
     async def request_restart(self) -> None:
         await self.hass.services.async_call("homeassistant", "restart", {}, blocking=False)
\ No newline at end of file