--- nut-2.2.2/drivers/apcsmart.h~	2008-06-10 16:43:03.000000000 +0200
+++ nut-2.2.2/drivers/apcsmart.h	2008-06-12 17:14:18.000000000 +0200
@@ -265,6 +265,7 @@
 	/* APC Matrix */
 	{ "0ZI",	"79ABCDEFGKLMNOPQRSUVWXYZcefgjklmnopqrsuxz/<>", 0 },
 	{ "5UI",	"79ABCDEFGKLMNOPQRSUVWXYZcefgjklmnopqrsuxz/<>", 0 },
+	{ "5YI",	"789ABCDEFGLMNOPQTUVWXYcefgjklmnopqrsuwxyz\\<>/", 0 },
 
 	{ NULL,		NULL,			0 },
 };
--- nut-2.2.2/drivers/apcsmart.c~	2007-12-12 21:34:51.000000000 +0100
+++ nut-2.2.2/drivers/apcsmart.c	2008-06-12 17:38:28.000000000 +0200
@@ -540,8 +540,8 @@
 				!strcmp(buf, "6QI")) { /* (APC600.) */
 			upsdebugx(1, "Found Smart-UPS");
 			dstate_setinfo("ups.model", "Smart-UPS");
-		}
-		else return 0;
+		} else if (strcmp(buf, "5YI")) /* Matrix */
+			return 0;
 	}
 
 	upsdebugx(2, "Firmware: [%s]", buf);