diff --git a/src/mainboard/google/brya/variants/joxer/overridetree.cb b/src/mainboard/google/brya/variants/joxer/overridetree.cb
index dbfeb6d..8ec3b21 100644
--- a/src/mainboard/google/brya/variants/joxer/overridetree.cb
+++ b/src/mainboard/google/brya/variants/joxer/overridetree.cb
@@ -1,3 +1,10 @@
+fw_config
+	field WIFI_SAR_ID 6 6
+		option WIFI_GFP2_SAR_ID_0	0
+		option WIFI_GFP2_SAR_ID_1	1
+		end
+end
+
 chip soc/intel/alderlake
 	register "sagv" = "SaGv_Enabled"
 
diff --git a/src/mainboard/google/brya/variants/joxer/variant.c b/src/mainboard/google/brya/variants/joxer/variant.c
index 7db0617..3c23dd1 100644
--- a/src/mainboard/google/brya/variants/joxer/variant.c
+++ b/src/mainboard/google/brya/variants/joxer/variant.c
@@ -9,7 +9,7 @@
 
 const char *get_wifi_sar_cbfs_filename(void)
 {
-	return "wifi_sar_0.hex";
+	return get_wifi_sar_fw_config_filename(FW_CONFIG_FIELD(WIFI_SAR_ID));
 }
 
 void variant_devtree_update(void)