diff --git a/.changeset/moody-clocks-carry.md b/.changeset/moody-clocks-carry.md
new file mode 100644
index 000000000..a265cf6c2
--- /dev/null
+++ b/.changeset/moody-clocks-carry.md
@@ -0,0 +1,5 @@
+---
+"@turnkey/sdk-browser": minor
+---
+
+Fix readWrite session to use credentialBundle and add loginWithAuthBundle to create a session when you already have a credentialBundle
diff --git a/packages/sdk-browser/src/sdk-client.ts b/packages/sdk-browser/src/sdk-client.ts
index 239f30977..e94ad9320 100644
--- a/packages/sdk-browser/src/sdk-client.ts
+++ b/packages/sdk-browser/src/sdk-client.ts
@@ -279,9 +279,9 @@ export class TurnkeyBrowserClient extends TurnkeySDKClientBase {
    * To be used in conjunction with an `iframeStamper`: the resulting session's credential bundle can be
    * injected into an iframeStamper to create a session that enables both read and write requests.
    *
-   * @param email
    * @param targetEmbeddedKey
    * @param expirationSeconds
+   * @param userId
    * @returns {Promise<SdkApiTypes.TCreateReadWriteSessionResponse>}
    */
   loginWithReadWriteSession = async (
@@ -298,7 +298,7 @@ export class TurnkeyBrowserClient extends TurnkeySDKClientBase {
     // Ensure session and sessionExpiry are included in the object
     const readWriteSessionResultWithSession = {
       ...readWriteSessionResult,
-      session: readWriteSessionResult.credentialBundle,
+      credentialBundle: readWriteSessionResult.credentialBundle,
       sessionExpiry: Date.now() + Number(expirationSeconds) * 1000,
     };
 
@@ -307,6 +307,32 @@ export class TurnkeyBrowserClient extends TurnkeySDKClientBase {
 
     return readWriteSessionResultWithSession;
   };
+
+  /**
+   * Logs in with an existing auth bundle. this bundle enables both read and write requests.
+   *
+   * @param credentialBundle
+   * @param expirationSeconds
+   * @returns {Promise<boolean>}
+   */
+  loginWithAuthBundle = async (
+    credentialBundle: string,
+    expirationSeconds: string = DEFAULT_SESSION_EXPIRATION
+  ): Promise<any> => {
+    try {
+      const whoAmIResult = await this.getWhoami();
+
+      const readWriteSessionResultWithSession = {
+        ...whoAmIResult,
+        credentialBundle: credentialBundle,
+        sessionExpiry: Date.now() + Number(expirationSeconds) * 1000,
+      };
+      await saveSession(readWriteSessionResultWithSession, this.authClient);
+      return true;
+    } catch {
+      return false;
+    }
+  };
 }
 
 export class TurnkeyPasskeyClient extends TurnkeyBrowserClient {