diff --git a/internal/api/third/minio_storage_credential.go b/internal/api/third/minio_storage_credential.go
index 4c6fad1f2..07b256e0f 100644
--- a/internal/api/third/minio_storage_credential.go
+++ b/internal/api/third/minio_storage_credential.go
@@ -15,6 +15,8 @@ import (
 	_ "github.com/minio/minio-go/v7"
 	cr "github.com/minio/minio-go/v7/pkg/credentials"
 	"net/http"
+	"strconv"
+	"strings"
 )
 
 // @Summary minio上传文件(web api)
@@ -218,6 +220,13 @@ func UploadUpdateApp(c *gin.Context) {
 	c.JSON(http.StatusOK, resp)
 }
 
+func version2Int(version string) (int, error) {
+	versions := strings.Split(version, ".")
+	s := strings.Join(versions, "")
+	versionInt, err := strconv.Atoi(s)
+	return versionInt, err
+}
+
 func GetDownloadURL(c *gin.Context) {
 	var (
 		req  api.GetDownloadURLReq
@@ -238,7 +247,13 @@ func GetDownloadURL(c *gin.Context) {
 	}
 	log.Debug(req.OperationID, utils.GetSelfFuncName(), "app: ", app)
 	if app != nil {
-		if app.Version != req.Version && app.Version != "" {
+		appVersion, err := version2Int(app.Version)
+		reqVersion, err := version2Int(req.Version)
+		if err != nil {
+			log.NewError(req.OperationID, utils.GetSelfFuncName(), err.Error(), "req version", req.Version, "app version", app.Version)
+		}
+		log.NewDebug(req.OperationID, utils.GetSelfFuncName(), "req version:", reqVersion, "app version:", appVersion)
+		if appVersion > reqVersion && app.Version != "" {
 			resp.Data.HasNewVersion = true
 			if app.ForceUpdate == true {
 				resp.Data.ForceUpdate = true
diff --git a/internal/cron_task/clear_msg.go b/internal/cron_task/clear_msg.go
index 41c1b18e0..3c43e3e20 100644
--- a/internal/cron_task/clear_msg.go
+++ b/internal/cron_task/clear_msg.go
@@ -2,11 +2,13 @@ package cronTask
 
 import (
 	"Open_IM/pkg/common/config"
+	"Open_IM/pkg/common/constant"
 	"Open_IM/pkg/common/db"
 	"Open_IM/pkg/common/log"
 	server_api_params "Open_IM/pkg/proto/sdk_ws"
 	"Open_IM/pkg/utils"
 	"github.com/golang/protobuf/proto"
+	"math"
 )
 
 const oldestList = 0
@@ -19,6 +21,7 @@ func ResetUserGroupMinSeq(operationID, groupID string, userIDList []string) erro
 		log.NewError(operationID, utils.GetSelfFuncName(), groupID, "deleteMongoMsg failed")
 		return utils.Wrap(err, "")
 	}
+	log.NewDebug(operationID, utils.GetSelfFuncName(), "delMsgIDList:", delMsgIDList, "minSeq", minSeq)
 	for _, userID := range userIDList {
 		userMinSeq, err := db.DB.GetGroupUserMinSeq(groupID, userID)
 		if err != nil {
@@ -43,7 +46,7 @@ func DeleteMongoMsgAndResetRedisSeq(operationID, userID string) error {
 	if err != nil {
 		return utils.Wrap(err, "")
 	}
-	log.NewDebug(operationID, utils.GetSelfFuncName(), "delMsgIDMap: ", userID, delMsgIDList)
+	log.NewDebug(operationID, utils.GetSelfFuncName(), "delMsgIDMap: ", delMsgIDList, "minSeq", minSeq)
 	err = db.DB.SetUserMinSeq(userID, minSeq)
 	return err
 }
@@ -123,3 +126,29 @@ func getDelMaxSeqByIDList(delMsgIDList [][2]interface{}) uint32 {
 	}
 	return delMsgIDList[len(delMsgIDList)-1][1].(uint32)
 }
+
+func checkMaxSeqWithMongo(operationID, ID string, diffusionType int) error {
+	var maxSeq uint64
+	var err error
+	if diffusionType == constant.WriteDiffusion {
+		maxSeq, err = db.DB.GetUserMaxSeq(ID)
+	} else {
+		maxSeq, err = db.DB.GetGroupMaxSeq(ID)
+	}
+	if err != nil {
+		return utils.Wrap(err, "GetUserMaxSeq failed")
+	}
+	msg, err := db.DB.GetNewestMsg(ID)
+	if err != nil {
+		return utils.Wrap(err, "GetNewestMsg failed")
+	}
+	msgPb := &server_api_params.MsgData{}
+	err = proto.Unmarshal(msg.Msg, msgPb)
+	if err != nil {
+		return utils.Wrap(err, "")
+	}
+	if math.Abs(float64(msgPb.Seq-uint32(maxSeq))) > 10 {
+		log.NewWarn(operationID, utils.GetSelfFuncName(), maxSeq, msgPb.Seq, "redis maxSeq is different with msg.Seq")
+	}
+	return nil
+}
diff --git a/internal/cron_task/cron_task.go b/internal/cron_task/cron_task.go
index 625ab539c..0b1784b20 100644
--- a/internal/cron_task/cron_task.go
+++ b/internal/cron_task/cron_task.go
@@ -28,6 +28,9 @@ func StartCronTask() {
 				if err := DeleteMongoMsgAndResetRedisSeq(operationID, userID); err != nil {
 					log.NewError(operationID, utils.GetSelfFuncName(), err.Error(), userID)
 				}
+				if err := checkMaxSeqWithMongo(operationID, userID, constant.WriteDiffusion); err != nil {
+					log.NewError(operationID, utils.GetSelfFuncName(), userID, err)
+				}
 			}
 		} else {
 			log.NewError(operationID, utils.GetSelfFuncName(), err.Error())
@@ -45,7 +48,9 @@ func StartCronTask() {
 				if err := ResetUserGroupMinSeq(operationID, groupID, userIDList); err != nil {
 					log.NewError(operationID, utils.GetSelfFuncName(), err.Error(), groupID, userIDList)
 				}
-
+				if err := checkMaxSeqWithMongo(operationID, groupID, constant.ReadDiffusion); err != nil {
+					log.NewError(operationID, utils.GetSelfFuncName(), groupID, err)
+				}
 			}
 		} else {
 			log.NewError(operationID, utils.GetSelfFuncName(), err.Error())
@@ -56,6 +61,7 @@ func StartCronTask() {
 		fmt.Println("start cron failed", err.Error())
 		panic(err)
 	}
+
 	c.Start()
 	fmt.Println("start cron task success")
 	for {
diff --git a/internal/cron_task/test/main.go b/internal/cron_task/test/main.go
new file mode 100644
index 000000000..38dd16da6
--- /dev/null
+++ b/internal/cron_task/test/main.go
@@ -0,0 +1,3 @@
+package main
+
+func main() {}
diff --git a/internal/push/getui/push.go b/internal/push/getui/push.go
index a02a57ea8..69b4584f9 100644
--- a/internal/push/getui/push.go
+++ b/internal/push/getui/push.go
@@ -83,6 +83,7 @@ type Alert struct {
 type Android struct {
 	Ups struct {
 		Notification Notification `json:"notification"`
+		Options      Options      `json:"options"`
 	} `json:"ups"`
 }
 
@@ -92,6 +93,18 @@ type Notification struct {
 	ClickType string `json:"click_type"`
 }
 
+type Options struct {
+	HW struct {
+		DefaultSound bool   `json:"/message/android/notification/default_sound"`
+		ChannelID    string `json:"/message/android/notification/channel_id"`
+		Sound        string `json:"/message/android/notification/sound"`
+		Importance   string `json:"/message/android/notification/importance"`
+	} `json:"HW"`
+	XM struct {
+		ChannelID string `json:"/extra.channel_id"`
+	} `json:""`
+}
+
 type PushResp struct {
 }
 
@@ -133,6 +146,17 @@ func (g *Getui) Push(userIDList []string, alert, detailContent, operationID stri
 		Body:      alert,
 		ClickType: "startapp",
 	}
+	pushReq.PushChannel.Android.Ups.Options = Options{
+		HW: struct {
+			DefaultSound bool   `json:"/message/android/notification/default_sound"`
+			ChannelID    string `json:"/message/android/notification/channel_id"`
+			Sound        string `json:"/message/android/notification/sound"`
+			Importance   string `json:"/message/android/notification/importance"`
+		}{ChannelID: "RingRing4", Sound: "/raw/ring001", Importance: "importance"},
+		XM: struct {
+			ChannelID string `json:"/extra.channel_id"`
+		}{ChannelID: "Default"},
+	}
 	pushResp := PushResp{}
 	err = g.request(PushURL, pushReq, token, &pushResp, operationID)
 	switch err {
diff --git a/pkg/common/constant/constant.go b/pkg/common/constant/constant.go
index fecad1d32..0eab7c022 100644
--- a/pkg/common/constant/constant.go
+++ b/pkg/common/constant/constant.go
@@ -227,6 +227,11 @@ const (
 	WorkMomentAtUserNotification  = 2
 )
 
+const (
+	WriteDiffusion = 0
+	ReadDiffusion  = 1
+)
+
 const (
 	AtAllString       = "AtAllTag"
 	AtNormal          = 0
diff --git a/pkg/common/db/mongoModel.go b/pkg/common/db/mongoModel.go
index 083d89b2a..47b556b36 100644
--- a/pkg/common/db/mongoModel.go
+++ b/pkg/common/db/mongoModel.go
@@ -259,18 +259,22 @@ func (d *DataBases) GetMsgBySeqList(uid string, seqList []uint32, operationID st
 	return seqMsg, nil
 }
 
-func (d *DataBases) GetUserMsgListByIndex(ID string, index int64) (msg *UserChat, err error) {
+func (d *DataBases) GetUserMsgListByIndex(ID string, index int64) (*UserChat, error) {
 	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
 	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
 	regex := fmt.Sprintf("^%s", ID)
-	findOpts := options.Find().SetLimit(1).SetSkip(index).SetSort(bson.M{"$regex": regex})
-	msg = &UserChat{}
+	findOpts := options.Find().SetLimit(1).SetSkip(index).SetSort(bson.M{"$regex": regex}).SetSort(bson.M{"uid": 1})
+	var msgs []UserChat
 	cursor, err := c.Find(ctx, bson.M{"uid": bson.M{"$regex": regex}}, findOpts)
 	if err != nil {
 		return nil, err
 	}
-	err = cursor.Decode(&msg)
-	return msg, err
+	err = cursor.Decode(&msgs)
+	if len(msgs) > 0 {
+		return &msgs[0], err
+	} else {
+		return nil, errors.New("get msg list failed")
+	}
 }
 
 func (d *DataBases) DelMongoMsgs(IDList []string) error {
@@ -298,6 +302,26 @@ func (d *DataBases) ReplaceMsgToBlankByIndex(suffixID string, index int) error {
 	return err
 }
 
+func (d *DataBases) GetNewestMsg(ID string) (msg *MsgInfo, err error) {
+	ctx, _ := context.WithTimeout(context.Background(), time.Duration(config.Config.Mongo.DBTimeout)*time.Second)
+	c := d.mongoClient.Database(config.Config.Mongo.DBDatabase).Collection(cChat)
+	regex := fmt.Sprintf("^%s", ID)
+	findOpts := options.Find().SetLimit(1).SetSort(bson.M{"$regex": regex}).SetSort(bson.M{"uid": -1})
+	var userChats []UserChat
+	cursor, err := c.Find(ctx, bson.M{"uid": bson.M{"$regex": regex}}, findOpts)
+	if err != nil {
+		return nil, err
+	}
+	err = cursor.Decode(&userChats)
+	if len(userChats) > 0 {
+		if len(userChats[0].Msg) > 0 {
+			return &userChats[0].Msg[len(userChats[0].Msg)], nil
+		}
+		return nil, errors.New("len(userChats[0].Msg) < 0")
+	}
+	return nil, errors.New("len(userChats) < 0")
+}
+
 func (d *DataBases) GetMsgBySeqListMongo2(uid string, seqList []uint32, operationID string) (seqMsg []*open_im_sdk.MsgData, err error) {
 	var hasSeqList []uint32
 	singleCount := 0