diff --git a/board/qca/arm/common/crashdump.c b/board/qca/arm/common/crashdump.c
index cc951d8..a305a5e 100644
--- a/board/qca/arm/common/crashdump.c
+++ b/board/qca/arm/common/crashdump.c
@@ -179,7 +179,7 @@
 	}
 
 	if (usb_dump)
-		snprintf(runcmd, sizeof(runcmd), "fatwrite usb %d:%d 0x%x %s 0x%x",
+		snprintf(runcmd, sizeof(runcmd), "fatwrite usb %x:%x 0x%x %s 0x%x",
 					usb_dev_indx, usb_dev_part, memaddr, name, size);
 	else {
 		char *dumpdir;
@@ -406,7 +406,7 @@
 		int dev_indx, max_dev_avail = 0;
 		int part_indx = 0, part = -1;
 		int fat_fs = 0;
-		char dev_str[3]; //dev_str = dev:part
+		char dev_str[5]; /* dev:part */
 
 		if(run_command("usb start", 0) != CMD_RET_SUCCESS) {
 			printf("USB enumeration failed\n");
@@ -426,7 +426,7 @@
 			// get valid partition
 			for(part_indx = 1; part_indx <= MAX_SEARCH_PARTITIONS; part_indx++) {
 
-				snprintf(dev_str, sizeof(dev_str)+1, "%d:%d", dev_indx, part_indx);
+				snprintf(dev_str, sizeof(dev_str)+1, "%x:%x", dev_indx, part_indx);
 				part = get_device_and_partition("usb", dev_str, &stor_dev, &info, 1);
 
 				if (fat_set_blk_dev(stor_dev, &info) == 0) {