diff --git a/client/builders.go b/client/builders.go
index 0c7bd83f..5558c2f0 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -137,9 +137,8 @@ func (c *QQClient) buildDeviceLockLoginPacket() (uint16, []byte) {
 }
 
 func (c *QQClient) buildQRCodeFetchRequestPacket(size, margin, ecLevel uint32) (uint16, []byte) {
-	version := c.transport.Version
 	watch := auth.AndroidWatch.Version()
-	c.transport.Version = watch
+	c.transport.Version = &watch
 	seq := c.nextSeq()
 	req := oicq.Message{
 		Command:          0x0812,
@@ -173,13 +172,13 @@ func (c *QQClient) buildQRCodeFetchRequestPacket(size, margin, ecLevel uint32) (
 		Body:        c.oicq.Marshal(&req),
 	}
 	payload := c.transport.PackPacket(&r)
-	c.transport.Version = version
+	c.transport.Version = &c.version
 	return seq, payload
 }
 
 func (c *QQClient) buildQRCodeResultQueryRequestPacket(sig []byte) (uint16, []byte) {
-	version := c.transport.Version
-	c.transport.Version = auth.AndroidWatch.Version()
+	watch := auth.AndroidWatch.Version()
+	c.transport.Version = &watch
 	seq := c.nextSeq()
 	req := oicq.Message{
 		Command:          0x0812,
@@ -209,7 +208,7 @@ func (c *QQClient) buildQRCodeResultQueryRequestPacket(sig []byte) (uint16, []by
 		Body:        c.oicq.Marshal(&req),
 	}
 	payload := c.transport.PackPacket(&r)
-	c.transport.Version = version
+	c.transport.Version = &c.version
 	return seq, payload
 }
 
diff --git a/client/client.go b/client/client.go
index 3e579ca0..bac2f7e5 100644
--- a/client/client.go
+++ b/client/client.go
@@ -4,7 +4,6 @@ import (
 	"crypto/md5"
 	"fmt"
 	"math/rand"
-	"net"
 	"net/netip"
 	"sort"
 	"strconv"
@@ -62,6 +61,7 @@ type QQClient struct {
 	// internal state
 	handlers        syncx.Map[uint16, *handlerInfo]
 	waiters         syncx.Map[string, func(any, error)]
+	initServerOnce  sync.Once
 	servers         []netip.AddrPort
 	currServerIndex int
 	retryTimes      int
@@ -197,15 +197,12 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 		onlinePushCache: utils.NewCache[unit](time.Second * 15),
 		alive:           true,
 		highwaySession:  new(highway.Session),
-
-		version: new(auth.AppVersion),
-		device:  new(auth.Device),
 	}
 
 	cli.transport = &network.Transport{
 		Sig:     cli.sig,
-		Version: cli.version,
-		Device:  cli.device,
+		Version: &cli.version,
+		Device:  &cli.device,
 	}
 	cli.oicq = oicq.NewCodec(cli.Uin)
 	{ // init atomic values
@@ -217,62 +214,18 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 	}
 	cli.highwaySession.Uin = strconv.FormatInt(cli.Uin, 10)
 	cli.GuildService = &GuildService{c: cli}
-	cli.UseDevice(SystemDeviceInfo)
-	sso, err := getSSOAddress()
-	if err == nil && len(sso) > 0 {
-		cli.servers = append(sso, cli.servers...)
-	}
-	adds, err := net.LookupIP("msfwifi.3g.qq.com") // host servers
-	if err == nil && len(adds) > 0 {
-		var hostAddrs []netip.AddrPort
-		for _, addr := range adds {
-			ip, ok := netip.AddrFromSlice(addr.To4())
-			if ok {
-				hostAddrs = append(hostAddrs, netip.AddrPortFrom(ip, 8080))
-			}
-		}
-		cli.servers = append(hostAddrs, cli.servers...)
-	}
-	if len(cli.servers) == 0 {
-		cli.servers = []netip.AddrPort{ // default servers
-			netip.AddrPortFrom(netip.AddrFrom4([4]byte{42, 81, 172, 81}), 80),
-			netip.AddrPortFrom(netip.AddrFrom4([4]byte{114, 221, 148, 59}), 14000),
-			netip.AddrPortFrom(netip.AddrFrom4([4]byte{42, 81, 172, 147}), 443),
-			netip.AddrPortFrom(netip.AddrFrom4([4]byte{125, 94, 60, 146}), 80),
-			netip.AddrPortFrom(netip.AddrFrom4([4]byte{114, 221, 144, 215}), 80),
-			netip.AddrPortFrom(netip.AddrFrom4([4]byte{42, 81, 172, 22}), 80),
-		}
-	}
-	pings := make([]int64, len(cli.servers))
-	wg := sync.WaitGroup{}
-	wg.Add(len(cli.servers))
-	// println(len(cli.servers))
-	for i := range cli.servers {
-		go func(index int) {
-			defer wg.Done()
-			p, err := qualityTest(cli.servers[index].String())
-			if err != nil {
-				pings[index] = 9999
-				return
-			}
-			pings[index] = p
-		}(i)
-	}
-	wg.Wait()
-	sort.Slice(cli.servers, func(i, j int) bool {
-		return pings[i] < pings[j]
-	})
-	if len(cli.servers) > 3 {
-		cli.servers = cli.servers[0 : len(cli.servers)/2] // 保留ping值中位数以上的server
-	}
 	cli.TCP.PlannedDisconnect(cli.plannedDisconnect)
 	cli.TCP.UnexpectedDisconnect(cli.unexpectedDisconnect)
 	return cli
 }
 
+func (c *QQClient) Device() *DeviceInfo {
+	return c.device
+}
+
 func (c *QQClient) UseDevice(info *auth.Device) {
-	*c.version = *info.Protocol.Version()
-	*c.device = *info
+	c.version = info.Protocol.Version()
+	c.device = info
 	c.highwaySession.AppID = int32(c.version.AppId)
 	c.sig.Ksid = []byte(fmt.Sprintf("|%s|A8.2.7.27f6ea96", info.IMEI))
 }
diff --git a/client/global.go b/client/global.go
index fd60eb46..c5c15e70 100644
--- a/client/global.go
+++ b/client/global.go
@@ -31,66 +31,57 @@ type (
 	Version    = auth.OSVersion
 )
 
-var SystemDeviceInfo = &DeviceInfo{
-	Display:      []byte("MIRAI.123456.001"),
-	Product:      []byte("mirai"),
-	Device:       []byte("mirai"),
-	Board:        []byte("mirai"),
-	Brand:        []byte("mamoe"),
-	Model:        []byte("mirai"),
-	Bootloader:   []byte("unknown"),
-	FingerPrint:  []byte("mamoe/mirai/mirai:10/MIRAI.200122.001/1234567:user/release-keys"),
-	BootId:       []byte("cb886ae2-00b6-4d68-a230-787f111d12c7"),
-	ProcVersion:  []byte("Linux version 3.0.31-cb886ae2 (android-build@xxx.xxx.xxx.xxx.com)"),
-	BaseBand:     EmptyBytes,
-	SimInfo:      []byte("T-Mobile"),
-	OSType:       []byte("android"),
-	MacAddress:   []byte("00:50:56:C0:00:08"),
-	IpAddress:    []byte{10, 0, 1, 3}, // 10.0.1.3
-	WifiBSSID:    []byte("00:50:56:C0:00:08"),
-	WifiSSID:     []byte("<unknown ssid>"),
-	IMEI:         "468356291846738",
-	AndroidId:    []byte("MIRAI.123456.001"),
-	APN:          []byte("wifi"),
-	VendorName:   []byte("MIUI"),
-	VendorOSName: []byte("mirai"),
-	Protocol:     IPad,
-	Version: &Version{
-		Incremental: []byte("5891938"),
-		Release:     []byte("10"),
-		CodeName:    []byte("REL"),
-		SDK:         29,
-	},
-}
-
 var EmptyBytes = make([]byte, 0)
 
-func init() {
-	r := make([]byte, 16)
-	crand.Read(r)
-	t := md5.Sum(r)
-	SystemDeviceInfo.IMSIMd5 = t[:]
-	SystemDeviceInfo.GenNewGuid()
-	SystemDeviceInfo.GenNewTgtgtKey()
-}
-
-func GenRandomDevice() {
+func GenRandomDevice() *DeviceInfo {
 	r := make([]byte, 16)
 	crand.Read(r)
 	const numberRange = "0123456789"
-	SystemDeviceInfo.Display = []byte("MIRAI." + utils.RandomStringRange(6, numberRange) + ".001")
-	SystemDeviceInfo.FingerPrint = []byte("mamoe/mirai/mirai:10/MIRAI.200122.001/" + utils.RandomStringRange(7, numberRange) + ":user/release-keys")
-	SystemDeviceInfo.BootId = binary.GenUUID(r)
-	SystemDeviceInfo.ProcVersion = []byte("Linux version 3.0.31-" + utils.RandomString(8) + " (android-build@xxx.xxx.xxx.xxx.com)")
+
+	var device = &DeviceInfo{
+		Product:      []byte("mirai"),
+		Device:       []byte("mirai"),
+		Board:        []byte("mirai"),
+		Brand:        []byte("mamoe"),
+		Model:        []byte("mirai"),
+		Bootloader:   []byte("unknown"),
+		BootId:       []byte("cb886ae2-00b6-4d68-a230-787f111d12c7"),
+		ProcVersion:  []byte("Linux version 3.0.31-cb886ae2 (android-build@xxx.xxx.xxx.xxx.com)"),
+		BaseBand:     EmptyBytes,
+		SimInfo:      []byte("T-Mobile"),
+		OSType:       []byte("android"),
+		MacAddress:   []byte("00:50:56:C0:00:08"),
+		IpAddress:    []byte{10, 0, 1, 3}, // 10.0.1.3
+		WifiBSSID:    []byte("00:50:56:C0:00:08"),
+		WifiSSID:     []byte("<unknown ssid>"),
+		IMEI:         "468356291846738",
+		AndroidId:    []byte("MIRAI.123456.001"),
+		APN:          []byte("wifi"),
+		VendorName:   []byte("MIUI"),
+		VendorOSName: []byte("mirai"),
+		Protocol:     IPad,
+		Version: &Version{
+			Incremental: []byte("5891938"),
+			Release:     []byte("10"),
+			CodeName:    []byte("REL"),
+			SDK:         29,
+		},
+	}
+
+	device.Display = []byte("MIRAI." + utils.RandomStringRange(6, numberRange) + ".001")
+	device.FingerPrint = []byte("mamoe/mirai/mirai:10/MIRAI.200122.001/" + utils.RandomStringRange(7, numberRange) + ":user/release-keys")
+	device.BootId = binary.GenUUID(r)
+	device.ProcVersion = []byte("Linux version 3.0.31-" + utils.RandomString(8) + " (android-build@xxx.xxx.xxx.xxx.com)")
 	crand.Read(r)
 	t := md5.Sum(r)
-	SystemDeviceInfo.IMSIMd5 = t[:]
-	SystemDeviceInfo.IMEI = GenIMEI()
+	device.IMSIMd5 = t[:]
+	device.IMEI = GenIMEI()
 	r = make([]byte, 8)
 	crand.Read(r)
-	hex.Encode(SystemDeviceInfo.AndroidId, r)
-	SystemDeviceInfo.GenNewGuid()
-	SystemDeviceInfo.GenNewTgtgtKey()
+	hex.Encode(device.AndroidId, r)
+	device.GenNewGuid()
+	device.GenNewTgtgtKey()
+	return device
 }
 
 func GenIMEI() string {
@@ -114,13 +105,13 @@ func GenIMEI() string {
 	return final.String()
 }
 
-func getSSOAddress() ([]netip.AddrPort, error) {
-	protocol := SystemDeviceInfo.Protocol.Version()
+func getSSOAddress(device *auth.Device) ([]netip.AddrPort, error) {
+	protocol := device.Protocol.Version()
 	key, _ := hex.DecodeString("F0441F5FF42DA58FDCF7949ABA62D411")
 	payload := jce.NewJceWriter(). // see ServerConfig.d
 					WriteInt64(0, 1).WriteInt64(0, 2).WriteByte(1, 3).
 					WriteString("00000", 4).WriteInt32(100, 5).
-					WriteInt32(int32(protocol.AppId), 6).WriteString(SystemDeviceInfo.IMEI, 7).
+					WriteInt32(int32(protocol.AppId), 6).WriteString(device.IMEI, 7).
 					WriteInt64(0, 8).WriteInt64(0, 9).WriteInt64(0, 10).
 					WriteInt64(0, 11).WriteByte(0, 12).WriteInt64(0, 13).Bytes()
 	buf := &jce.RequestDataVersion3{
diff --git a/client/internal/auth/device.go b/client/internal/auth/device.go
index 27a1d3f5..9dde0f37 100644
--- a/client/internal/auth/device.go
+++ b/client/internal/auth/device.go
@@ -139,6 +139,14 @@ func (info *Device) ReadJson(d []byte) error {
 	default:
 		info.Protocol = IPad
 	}
+
+	v := new(OSVersion)
+	v.SDK = f.Version.Sdk
+	v.Release = []byte(f.Version.Release)
+	v.CodeName = []byte(f.Version.Codename)
+	v.Incremental = []byte(f.Version.Incremental)
+	info.Version = v
+
 	info.GenNewGuid()
 	info.GenNewTgtgtKey()
 	return nil
diff --git a/client/internal/network/transport.go b/client/internal/network/transport.go
index 26417ffc..f258e4c0 100644
--- a/client/internal/network/transport.go
+++ b/client/internal/network/transport.go
@@ -10,8 +10,8 @@ import (
 // Transport is a network transport.
 type Transport struct {
 	Sig     *auth.SigInfo
-	Version *auth.AppVersion
-	Device  *auth.Device
+	Version **auth.AppVersion
+	Device  **auth.Device
 
 	// connection
 	// conn *TCPClient
@@ -21,8 +21,8 @@ func (t *Transport) packBody(req *Request, w *binary.Writer) {
 	pos := w.FillUInt32()
 	if req.Type == RequestTypeLogin {
 		w.WriteUInt32(uint32(req.SequenceID))
-		w.WriteUInt32(t.Version.AppId)
-		w.WriteUInt32(t.Version.SubAppId)
+		w.WriteUInt32((*t.Version).AppId)
+		w.WriteUInt32((*t.Version).SubAppId)
 		w.Write([]byte{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00})
 		tgt := t.Sig.TGT
 		if len(tgt) == 0 || len(tgt) == 4 {
@@ -36,7 +36,7 @@ func (t *Transport) packBody(req *Request, w *binary.Writer) {
 	w.WriteUInt32(uint32(len(t.Sig.OutPacketSessionID) + 4))
 	w.Write(t.Sig.OutPacketSessionID)
 	if req.Type == RequestTypeLogin {
-		w.WriteString(t.Device.IMEI)
+		w.WriteString((*t.Device).IMEI)
 		w.WriteUInt32(0x04)
 
 		w.WriteUInt16(uint16(len(t.Sig.Ksid)) + 2)
diff --git a/client/network.go b/client/network.go
index 55c74f41..6b74d7e9 100644
--- a/client/network.go
+++ b/client/network.go
@@ -2,7 +2,9 @@ package client
 
 import (
 	"net"
+	"net/netip"
 	"runtime/debug"
+	"sort"
 	"sync"
 	"time"
 
@@ -86,8 +88,65 @@ func (c *QQClient) ConnectionQualityTest() *ConnectionQualityInfo {
 	return r
 }
 
+func (c *QQClient) initServers() {
+	if c.device == nil {
+		// must have device. Use c.UseDevice to set it!
+		panic("client device is nil")
+	}
+
+	sso, err := getSSOAddress(c.device)
+	if err == nil && len(sso) > 0 {
+		c.servers = append(sso, c.servers...)
+	}
+	adds, err := net.LookupIP("msfwifi.3g.qq.com") // host servers
+	if err == nil && len(adds) > 0 {
+		var hostAddrs []netip.AddrPort
+		for _, addr := range adds {
+			ip, ok := netip.AddrFromSlice(addr.To4())
+			if ok {
+				hostAddrs = append(hostAddrs, netip.AddrPortFrom(ip, 8080))
+			}
+		}
+		c.servers = append(hostAddrs, c.servers...)
+	}
+	if len(c.servers) == 0 {
+		c.servers = []netip.AddrPort{ // default servers
+			netip.AddrPortFrom(netip.AddrFrom4([4]byte{42, 81, 172, 81}), 80),
+			netip.AddrPortFrom(netip.AddrFrom4([4]byte{114, 221, 148, 59}), 14000),
+			netip.AddrPortFrom(netip.AddrFrom4([4]byte{42, 81, 172, 147}), 443),
+			netip.AddrPortFrom(netip.AddrFrom4([4]byte{125, 94, 60, 146}), 80),
+			netip.AddrPortFrom(netip.AddrFrom4([4]byte{114, 221, 144, 215}), 80),
+			netip.AddrPortFrom(netip.AddrFrom4([4]byte{42, 81, 172, 22}), 80),
+		}
+	}
+	pings := make([]int64, len(c.servers))
+	wg := sync.WaitGroup{}
+	wg.Add(len(c.servers))
+	for i := range c.servers {
+		go func(index int) {
+			defer wg.Done()
+			p, err := qualityTest(c.servers[index].String())
+			if err != nil {
+				pings[index] = 9999
+				return
+			}
+			pings[index] = p
+		}(i)
+	}
+	wg.Wait()
+	sort.Slice(c.servers, func(i, j int) bool {
+		return pings[i] < pings[j]
+	})
+	if len(c.servers) > 3 {
+		c.servers = c.servers[0 : len(c.servers)/2] // 保留ping值中位数以上的server
+	}
+}
+
 // connect 连接到 QQClient.servers 中的服务器
 func (c *QQClient) connect() error {
+	// init qq servers
+	c.initServerOnce.Do(c.initServers)
+
 	addr := c.servers[c.currServerIndex].String()
 	c.info("connect to server: %v", addr)
 	err := c.TCP.Connect(addr)