diff --git a/application/quectel_CM_5G_M/src/QMIThread.c b/application/quectel_CM_5G_M/src/QMIThread.c
index ca49704..53c834f 100644
--- a/application/quectel_CM_5G_M/src/QMIThread.c
+++ b/application/quectel_CM_5G_M/src/QMIThread.c
@@ -2353,6 +2353,17 @@ static int requestBaseBandVersion(PROFILE_T *profile) {
     {
         uchar2char(profile->BaseBandVersion, sizeof(profile->BaseBandVersion), &revId->RevisionID, le16_to_cpu(revId->TLVLength));
         dbg_time("%s %s", __func__, profile->BaseBandVersion);
+        
+#ifdef CONFIG_FOXCONN_FCC_AUTH
+        // Check if this modem model needs FCC authentication
+        if (strstr(profile->BaseBandVersion, "T99W175")) {
+            profile->needs_fcc_auth = 1;
+            dbg_time("Modem model %s requires FCC authentication", profile->BaseBandVersion);
+        } else {
+            profile->needs_fcc_auth = 0;
+            dbg_time("Modem model %s does not require FCC authentication", profile->BaseBandVersion);
+        }
+#endif
     }
 
     free(pResponse);
diff --git a/application/quectel_CM_5G_M/src/main.c b/application/quectel_CM_5G_M/src/main.c
index bd0f00b..a1f64be 100644
--- a/application/quectel_CM_5G_M/src/main.c
+++ b/application/quectel_CM_5G_M/src/main.c
@@ -325,6 +325,37 @@ static int qmi_main(PROFILE_T *profile)
     if (request_ops->requestSetEthMode)
         request_ops->requestSetEthMode(profile);
 
+#ifdef CONFIG_FOXCONN_FCC_AUTH
+    // Only execute FCC authentication if the modem model requires it
+    if (profile->needs_fcc_auth) {
+        dbg_time("Executing FCC authentication for modem model: %s", profile->BaseBandVersion);
+        
+        if (request_ops->requestFoxconnSetFccAuthentication) {
+            // Use magic value 0x01 as seen in libqmi
+            qmierr = request_ops->requestFoxconnSetFccAuthentication(0x01);
+            if (qmierr) {
+                dbg_time("Foxconn FCC Authentication failed with error: %d", qmierr);
+            } else {
+                dbg_time("Foxconn FCC Authentication successful");
+            }
+        }
+        
+        if (request_ops->requestFoxconnSetFccAuthenticationV2) {
+            // Based on libqmi, use "FOXCONN" as magic string for Foxconn modems
+            const char *magic_string = "FOXCONN";  // Correct magic string for Foxconn
+            UCHAR magic_number = 0x01;  // Standard magic number from libqmi
+            
+            qmierr = request_ops->requestFoxconnSetFccAuthenticationV2(magic_string, magic_number);
+            if (qmierr) {
+                dbg_time("Foxconn FCC Authentication V2 failed with error: %d", qmierr);
+            } else {
+                dbg_time("Foxconn FCC Authentication V2 successful");
+            }
+        }
+    } else {
+        dbg_time("Skipping FCC authentication - not required for this modem model");
+    }
+#endif
     if (request_ops->requestSetLoopBackState && profile->loopback_state) {
     	qmierr = request_ops->requestSetLoopBackState(profile->loopback_state, profile->replication_factor);
     	if (qmierr != QMI_ERR_INVALID_QMI_CMD) //X20 return this error