diff --git a/src/installer-message.ts b/src/installer-message.ts
index d038d0c..d2c17e7 100644
--- a/src/installer-message.ts
+++ b/src/installer-message.ts
@@ -26,8 +26,12 @@ export const normalizeInstallSuccessMessage = (message: string): string =>
     ? "Identical to previous version -- not replacing"
     : "Successful deploy";
 
+// Both are empty-developer-slot signals: newer devices report "no plugin
+// installed", while older ones (e.g. Roku Stick 3500X) fail a delete/replace of
+// an empty slot with "No such file or directory". Treating either as an empty
+// slot makes delete idempotent and lets a Replace fall back to a fresh Install.
 export const isEmptyDeveloperSlotMessage = (message: string): boolean =>
-  /no plugin installed/i.test(message);
+  /no plugin installed/i.test(message) || /no such file or directory/i.test(message);
 
 export const isDeleteSuccess = (message: string): boolean =>
   isRecognizedInstallerMessage(message) &&
diff --git a/test/installer-message.test.ts b/test/installer-message.test.ts
new file mode 100644
index 0000000..f50c00f
--- /dev/null
+++ b/test/installer-message.test.ts
@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vite-plus/test";
+import { isDeleteSuccess, isEmptyDeveloperSlotMessage } from "../src/installer-message.js";
+
+describe("installer message classification", () => {
+  it("recognizes both empty developer-slot phrasings", () => {
+    expect(isEmptyDeveloperSlotMessage("No plugin installed")).toBe(true);
+    // Older devices fail a delete/replace of an empty slot this way.
+    expect(isEmptyDeveloperSlotMessage("Delete Failed: No such file or directory")).toBe(true);
+    expect(isEmptyDeveloperSlotMessage("Some unrelated installer message")).toBe(false);
+  });
+
+  it("treats delete success and empty-slot deletes as success, rejects real failures", () => {
+    expect(isDeleteSuccess("Delete Succeeded.")).toBe(true);
+    expect(isDeleteSuccess("Delete Failed: No such file or directory")).toBe(true);
+    expect(isDeleteSuccess("No plugin installed")).toBe(true);
+    expect(isDeleteSuccess("Install Failure: compilation failed")).toBe(false);
+    expect(isDeleteSuccess("Empty Roku installer response")).toBe(false);
+  });
+});