diff --git a/espReader/Derived.c b/espReader/Derived.c
index 3b491f5..775d29b 100644
--- a/espReader/Derived.c
+++ b/espReader/Derived.c
@@ -186,6 +186,7 @@ rfs_inner _achr = {
 	[11] = "Initially Disabled",
 	[25] = "No AI Acquire",
 	[29] = "Don't Havok Settle",
+	[30] = "ACHR Unknown 30",
 };
 
 rfs_inner _acti = {
diff --git a/espReader/Reader.c b/espReader/Reader.c
index 925397e..4f45bb6 100644
--- a/espReader/Reader.c
+++ b/espReader/Reader.c
@@ -77,7 +77,10 @@ const char *walk_unknown_data(const char *data, size_t size) {
 
 	const char *end = data + size;
 	while (data != end) {
-		assert(data < end);
+		if (data >= end) {
+			fflush(stdout);
+			assert(false);
+		}
 
 		const Type4 *type = (Type4 *)data; 
 
@@ -101,9 +104,10 @@ const char *walk_group(const char *data) {
 
 	const char *const start = data + sizeof(Group);
 	const char *const end = data + header->size;
+	size_t size = header->size - sizeof(Group);
 
 	// walk through the groups/records inside the group
-	data = walk_unknown_data(start, header->size);
+	data = walk_unknown_data(start, size);
 	assert(data == end);
 
 	return data;
@@ -205,7 +209,8 @@ void print_record_flags(Record *const header) {
 				if (str) {
 					printf("  - %s\n", str);
 					flags -= ((uint32_t)1) << highest;
-				}
+				} else
+					break;
 			}
 		}
 	}