diff --git a/src/utils/__tests__/platform-detect.test.ts b/src/utils/__tests__/platform-detect.test.ts
new file mode 100644
index 00000000..b9722b42
--- /dev/null
+++ b/src/utils/__tests__/platform-detect.test.ts
@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+
+import { PlatformDetector } from "../platform-detect";
+
+describe("PlatformDetector", () => {
+  it("treats OnePlus PKC110 as an OPPO-family keyboard fallback device", () => {
+    const ua =
+      "Mozilla/5.0 (Linux; Android 15; OnePlus PKC110 Build/AP3A.240617.008; wv) " +
+      "AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 " +
+      "Chrome/126.0.0.0 Mobile Safari/537.36 FBAN/FB4A";
+
+    expect(PlatformDetector.isOppoFamilyDevice(ua)).toBe(true);
+  });
+
+  it("does not treat other OnePlus models as OPPO-family fallback devices", () => {
+    const ua =
+      "Mozilla/5.0 (Linux; Android 15; NE2210 Build/AP3A.240617.008; wv) " +
+      "AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 " +
+      "Chrome/126.0.0.0 Mobile Safari/537.36 FBAN/FB4A";
+
+    expect(PlatformDetector.isOppoFamilyDevice(ua)).toBe(false);
+  });
+
+  it("keeps OPPO CPH models as OPPO-family fallback devices", () => {
+    const ua =
+      "Mozilla/5.0 (Linux; Android 15; OPPO CPH2609 Build/AP3A.240617.008; wv) " +
+      "AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 " +
+      "Chrome/126.0.0.0 Mobile Safari/537.36 FBAN/FB4A";
+
+    expect(PlatformDetector.isOppoFamilyDevice(ua)).toBe(true);
+  });
+});
diff --git a/src/utils/platform-detect.ts b/src/utils/platform-detect.ts
index a2a77526..11f568ff 100644
--- a/src/utils/platform-detect.ts
+++ b/src/utils/platform-detect.ts
@@ -94,6 +94,12 @@ export class PlatformDetector {
   static isOppoFamilyDevice(ua: string | null = null): boolean {
     const info = PlatformDetector.getPlatformInfo(ua);
     const target = `${info.deviceVendor} ${info.deviceModel} ${info.userAgent}`;
+    const isOnePlusFamily = /\bOnePlus\b/i.test(
+      `${info.deviceVendor} ${info.userAgent}`,
+    );
+    if (isOnePlusFamily) {
+      return /\bPKC110\b/i.test(`${info.deviceModel} ${info.userAgent}`);
+    }
     return /\b(OPPO|OPlus|ColorOS|CPH\d{3,})\b/i.test(target);
   }