diff --git a/ac101.c b/ac101.c
index 6d3e8eb..5f69467 100644
--- a/ac101.c
+++ b/ac101.c
@@ -1490,32 +1490,32 @@ int ac101_codec_resume(struct snd_soc_codec *codec)
 static ssize_t ac101_debug_store(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
-	static int val = 0, flag = 0;
-	u8 reg,num,i=0;
-	u16 value_w,value_r[128];
 	struct ac10x_priv *ac10x = dev_get_drvdata(dev);
+	int val = 0, flag = 0;
+	u16 value_w, value_r;
+	u8 reg, num, i=0;
+
 	val = simple_strtol(buf, NULL, 16);
 	flag = (val >> 24) & 0xF;
-	if(flag) {
+	if (flag) {
 		reg = (val >> 16) & 0xFF;
 		value_w =  val & 0xFFFF;
 		ac101_write(ac10x->codec, reg, value_w);
-		printk("write 0x%x to reg:0x%x\n",value_w,reg);
+		printk("write 0x%x to reg:0x%x\n", value_w, reg);
 	} else {
-		reg =(val>>8)& 0xFF;
-		num=val&0xff;
+		reg = (val >> 8) & 0xFF;
+		num = val & 0xff;
 		printk("\n");
-		printk("read:start add:0x%x,count:0x%x\n",reg,num);
+		printk("read:start add:0x%x,count:0x%x\n", reg, num);
+
+		regcache_cache_bypass(ac10x->regmap101, true);
 		do {
-			value_r[i] = ac101_read(ac10x->codec, reg);
-			printk("0x%x: 0x%04x ",reg,value_r[i]);
-			reg+=1;
-			i++;
-			if(i == num)
+			value_r = ac101_read(ac10x->codec, reg);
+			printk("0x%x: 0x%04x ", reg++, value_r);
+			if (++i % 4 == 0 || i == num)
 				printk("\n");
-			if(i%4==0)
-				printk("\n");
-		} while(i<num);
+		} while (i < num);
+		regcache_cache_bypass(ac10x->regmap101, false);
 	}
 	return count;
 }
@@ -1602,13 +1602,13 @@ int ac101_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 		return ret;
 	}
 
-	ac10x_fill_regcache(&i2c->dev, ac10x->regmap101);
-
 	/* Chip reset */
-	/*
+	regcache_cache_only(ac10x->regmap101, false);
 	ret = regmap_write(ac10x->regmap101, CHIP_AUDIO_RST, 0);
 	msleep(50);
-	*/
+
+	/* sync regcache for FLAT type */
+	ac10x_fill_regcache(&i2c->dev, ac10x->regmap101);
 
 	ret = regmap_read(ac10x->regmap101, CHIP_AUDIO_RST, &v);
 	if (ret < 0) {
diff --git a/ac108.c b/ac108.c
index 7048d82..e569e5b 100644
--- a/ac108.c
+++ b/ac108.c
@@ -173,8 +173,11 @@ static const DECLARE_TLV_DB_SCALE(tlv_ch_digital_vol, -11925,75,0);
 int ac10x_read(u8 reg, u8* rt_val, struct regmap* i2cm) {
 	int r, v = 0;
 
-	r = regmap_read(i2cm, reg, &v);
-	*rt_val = v;
+	if ((r = regmap_read(i2cm, reg, &v)) < 0) {
+		pr_err("ac10x_read error->[REG-0x%02x]\n", reg);
+	} else {
+		*rt_val = v;
+	}
 	return r;
 }
 
@@ -1325,12 +1328,16 @@ static ssize_t ac108_store(struct device *dev, struct device_attribute *attr, co
 		ac108_multi_write(reg, value_w, ac10x);
 		printk("Write 0x%02x to REG:0x%02x\n", value_w, reg);
 	} else {
+		int k;
+
 		reg = (val >> 8) & 0xFF;
 		num = val & 0xff;
 		printk("\nRead: start REG:0x%02x,count:0x%02x\n", reg, num);
 
+		for (k = 0; k < ac10x->codec_cnt; k++) {
+			regcache_cache_bypass(ac10x->i2cmap[k], true);
+		}
 		do {
-			int k;
 
 			memset(value_r, 0, sizeof value_r);
 
@@ -1348,6 +1355,9 @@ static ssize_t ac108_store(struct device *dev, struct device_attribute *attr, co
 				printk("\n");
 			}
 		} while (i < num);
+		for (k = 0; k < ac10x->codec_cnt; k++) {
+			regcache_cache_bypass(ac10x->i2cmap[k], false);
+		}
 	}
 
 	return count;
@@ -1429,15 +1439,17 @@ static int ac108_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *i
 		return ret;
 	}
 
-	ac10x_fill_regcache(&i2c->dev, ac10x->i2cmap[index]);
-
 	/*
 	 * Writing this register with 0x12 
 	 * will resets all register to their default state.
 	 */
+	regcache_cache_only(ac10x->i2cmap[index], false);
 	ret = regmap_write(ac10x->i2cmap[index], CHIP_RST, CHIP_RST_VAL);
 	msleep(1);
 
+	/* sync regcache for FLAT type */
+	ac10x_fill_regcache(&i2c->dev, ac10x->i2cmap[index]);
+
 	ac10x->codec_cnt++;
 	pr_err(" ac10x codec count  : %d\n", ac10x->codec_cnt);
 
diff --git a/install.sh b/install.sh
index 9fc2bd1..e41610b 100755
--- a/install.sh
+++ b/install.sh
@@ -57,7 +57,8 @@ cp seeed-8mic-voicecard.dtbo /boot/overlays
 
 #install alsa plugins
 # no need this plugin now
-# install -D ac108_plugin/libasound_module_pcm_ac108.so   /usr/lib/arm-linux-gnueabihf/alsa-lib/libasound_module_pcm_ac108.so
+# install -D ac108_plugin/libasound_module_pcm_ac108.so /usr/lib/arm-linux-gnueabihf/alsa-lib/libasound_module_pcm_ac108.so
+rm -f /usr/lib/arm-linux-gnueabihf/alsa-lib/libasound_module_pcm_ac108.so
 
 #set kernel moduels
 grep -q "snd-soc-seeed-voicecard" /etc/modules || \