diff --git a/V2RayX/ConfigImporter.m b/V2RayX/ConfigImporter.m
index b79c819..b3308a7 100644
--- a/V2RayX/ConfigImporter.m
+++ b/V2RayX/ConfigImporter.m
@@ -20,14 +20,96 @@ + (NSString* _Nonnull)decodeBase64String:(NSString*)encoded {
     }
     @try {
         NSData* decodedData = [[NSData alloc] initWithBase64EncodedString:fixed options:NSDataBase64DecodingIgnoreUnknownCharacters];
-        NSString* decodedString = [[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding];
+        // M1 12.6 (21G115) 版本转码结果nil 增加过滤
+        NSData* resultDate = [[[ConfigImporter alloc]init] replaceNoUtf8:decodedData];
+        NSString* decodedString = [[NSString alloc] initWithData:resultDate encoding:NSUTF8StringEncoding];
         assert(decodedString != nil);
         return decodedString;
     } @catch (NSException *exception) {
         return @"";
     }
 }
-
+//替换非utf8字符
+//注意：如果是三字节utf-8，第二字节错误，则先替换第一字节内容(认为此字节误码为三字节utf8的头)，然后判断剩下的两个字节是否非法；
+- (NSData *)replaceNoUtf8:(NSData *)data
+{
+    char aa[] = {'A','A','A','A','A','A'}; //utf8最多6个字符，当前方法未使用
+    NSMutableData *md = [NSMutableData dataWithData:data];
+    int loc = 0;
+    while (loc < [md length])
+    {
+        char buffer;
+        [md getBytes:&buffer range:NSMakeRange(loc, 1)];
+        if ((buffer & 0x80) == 0) //0xxx xxxx 1个Byte
+        {
+            loc++;
+            continue;
+        }
+        else if ((buffer & 0xE0) == 0xC0) //110x xxxx 2个Byte
+        {
+            loc++; //此处可能越界，要判断
+            if (loc >= md.length) { //此时的buffer已经是最后一个Byte
+                loc--;
+                //非法字符，将这个字符（一个byte）替换为A
+                [md replaceBytesInRange:NSMakeRange(loc, 1) withBytes:aa length:1];
+                break;
+            }
+            [md getBytes:&buffer range:NSMakeRange(loc, 1)];
+            if ((buffer & 0xC0) == 0x80) //10xx xxxx 第2个Byte
+            {
+                loc++;
+                continue;
+            }
+            loc--;
+            //非法字符，将这个字符（一个byte）替换为A
+            [md replaceBytesInRange:NSMakeRange(loc, 1) withBytes:aa length:1];
+            loc++;
+            continue;
+        }
+        else if ((buffer & 0xF0) == 0xE0) //1110 xxxx 3个Byte
+        {
+            loc++; //此处可能越界，要判断
+            if (loc >= md.length) { //此时的buffer已经是最后一个Byte
+                loc--;
+                //非法字符，将这个字符（一个byte）替换为A
+                [md replaceBytesInRange:NSMakeRange(loc, 1) withBytes:aa length:1];
+                break;
+            }
+            [md getBytes:&buffer range:NSMakeRange(loc, 1)];
+            if ((buffer & 0xC0) == 0x80) //10xx xxxx 第2个Byte
+            {
+                loc++; //此处可能越界，要判断
+                if (loc >= md.length) { //此时的buffer已经是最后一个Byte
+                    loc--;
+                    //非法字符，将这个字符（一个byte）替换为A
+                    [md replaceBytesInRange:NSMakeRange(loc, 1) withBytes:aa length:1];
+                    break;
+                }
+                [md getBytes:&buffer range:NSMakeRange(loc, 1)];
+                if ((buffer & 0xC0) == 0x80) //10xx xxxx 第3个Byte
+                {
+                    loc++;
+                    continue;
+                }
+                loc--;
+            }
+            loc--;
+            //非法字符，将这个字符（一个byte）替换为A
+            [md replaceBytesInRange:NSMakeRange(loc, 1) withBytes:aa length:1];
+            loc++;
+            continue;
+        }
+        else
+        {
+            //非法字符，将这个字符（一个byte）替换为A
+            [md replaceBytesInRange:NSMakeRange(loc, 1) withBytes:aa length:1];
+            loc++;
+            continue;
+        }
+    }
+    
+    return md;
+}
 + (NSDictionary*)parseLegacySSLink:(NSString*)link {
     //http://shadowsocks.org/en/config/quick-guide.html
     @try {