diff --git a/kernel/model/backlink.go b/kernel/model/backlink.go
index 37a3e71d3..877c63817 100644
--- a/kernel/model/backlink.go
+++ b/kernel/model/backlink.go
@@ -791,10 +791,15 @@ func searchBackmention(mentionKeywords []string, keyword string, excludeBacklink
 
 		text := textBuf.String()
 		text = strings.ToLower(text)
+		text = luteEngine.Space(text)
 		var contain bool
 		for _, mentionKeyword := range mentionKeywords {
 			parts := strings.Split(text, " ")
 			for _, part := range parts {
+				if "" == part {
+					continue
+				}
+
 				if gulu.Str.IsASCII(mentionKeyword) {
 					if part == mentionKeyword {
 						contain = true
diff --git a/kernel/model/search.go b/kernel/model/search.go
index b02220a22..57afce85a 100644
--- a/kernel/model/search.go
+++ b/kernel/model/search.go
@@ -649,8 +649,14 @@ func markReplaceSpan(text string, keywords []string, replacementStart, replaceme
 
 		for _, k := range keywords {
 			if gulu.Str.IsASCII(k) {
-				if part == k {
-					parts[i] = replacementStart + k + replacementEnd
+				if gulu.Str.IsASCII(part) {
+					if part == k {
+						parts[i] = replacementStart + k + replacementEnd
+					}
+				} else {
+					if strings.Contains(part, k) {
+						parts[i] = strings.ReplaceAll(part, k, replacementStart+k+replacementEnd)
+					}
 				}
 			} else {
 				if strings.Contains(part, k) {
diff --git a/kernel/model/updater.go b/kernel/model/updater.go
index a94c083b9..0ba434d08 100644
--- a/kernel/model/updater.go
+++ b/kernel/model/updater.go
@@ -156,8 +156,10 @@ func downloadInstallPkg(pkgURL, checksum string) {
 	logging.LogInfof("downloading install package [%s]", pkgURL)
 	msgId := util.PushMsg(Conf.Language(103), 60*1000*10)
 	client := req.C().SetTLSHandshakeTimeout(7 * time.Second).SetTimeout(10 * time.Minute)
-	err = client.NewParallelDownload(pkgURL).SetConcurrency(8).SetSegmentSize(1024 * 1024 * 2).
-		SetOutputFile(savePath).Do()
+	callback := func(info req.DownloadInfo) {
+		//logging.LogDebugf("downloading install package [%s %.2f%%]", pkgURL, float64(info.DownloadedSize)/float64(info.Response.ContentLength)*100.0)
+	}
+	_, err = client.R().SetOutputFile(savePath).SetDownloadCallback(callback).Get(pkgURL)
 	if nil != err {
 		logging.LogErrorf("download install package failed: %s", err)
 		util.PushUpdateMsg(msgId, Conf.Language(104), 7000)