diff --git a/doc/devices/SWTG024AS-V2.0.md b/doc/devices/SWTG024AS-V2.0.md
index 91b4ffc..c787428 100644
--- a/doc/devices/SWTG024AS-V2.0.md
+++ b/doc/devices/SWTG024AS-V2.0.md
@@ -17,8 +17,7 @@
 
 ### What works
 The device is fully supported:
-- Port 1-4 2.5GBASE-T RJ45 ports work at 10/100/1000/2500 Mbps
-- Port 5 2.5GBASE-T RJ45 ports through RTL8221B not work (Wait to fix)
+- ALL 2.5GBASE-T RJ45 ports work at 10/100/1000/2500 Mbps
 - The SFP+ port supports 1G, 2.5G and 10G modules 
 - LEDs work with the same indiciations as the OEM firmware
 - Online update does not work with 512KiB flash.
diff --git a/rtl837x_init.c b/rtl837x_init.c
index 50d94f6..e665688 100644
--- a/rtl837x_init.c
+++ b/rtl837x_init.c
@@ -76,6 +76,16 @@ void static sds_init(void)
 				sds_read(0, 0, 0);
 				pval = SFR_DATA_U16;
 				sds_write_v(0, 0, 0, pval | 0x200);
+#if defined MACHINE_SWTG024AS_V2_0
+				// OEM firmware also sets the companion SDS0 polarity bits.
+				sds_read(0, 0, 0);
+				pval = SFR_DATA_U16;
+				sds_write_v(0, 0, 0, pval | 0x100);
+
+				sds_read(0, 6, 2);
+				pval = SFR_DATA_U16;
+				sds_write_v(0, 6, 2, pval | 0x4000);
+#endif
 			}
 		} else if (machine.n_10g == 1) {
 			reg_read_m(RTL837X_CFG_PHY_MDI_REVERSE);