diff --git a/README.md b/README.md
index bc2ec71..161f259 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,54 @@ or
 # bash install-release.sh --remove
 ```
 
+### 證書權限問題
+
+假設，這書文件所在的路徑為 `/srv/http/`。
+
+文件分別為 `/srv/http/example.com.key` 和 `/srv/http/example.com.pem`。
+
+方案一：
+
+1. `/srv/http/` 的默認權限一般為 755；
+2. `/srv/http/example.com.key` 的默認權限一般為 600；
+3. `/srv/http/example.com.pem` 的默認權限一般為 644。
+
+將 `/srv/http/example.com.key` 修改為 644 即可：
+
+```
+# chmod 644 /srv/http/example.com.key
+```
+
+方案二：
+
+```
+# id nobody
+```
+
+1. 显示出来的结果可能是：
+
+    ```
+    uid=65534(nobody) gid=65534(nogroup) groups=65534(nogroup)
+    ```
+
+    相应的，只需要执行：
+
+    ```
+    # chown -R nobody:nogroup /srv/http/
+    ```
+
+2. 显示出来的结果也可能是：
+
+    ```
+    uid=65534(nobody) gid=65534(nobody) groups=65534(nobody)
+    ```
+
+    相应的，只需要执行：
+
+    ```
+    # chown -R nobody:nobody /srv/http/
+    ```
+
 ## 參數
 
 ```
diff --git a/install-dat-release.sh b/install-dat-release.sh
index 6a0c652..dbd876c 100644
--- a/install-dat-release.sh
+++ b/install-dat-release.sh
@@ -26,11 +26,11 @@ check_if_running_as_root() {
 }
 
 download_geoip() {
-    if ! curl -L -H 'Cache-Control: no-cache' -o "${V2RAY}geoip.dat.new" "$DOWNLOAD_LINK_GEOIP"; then
+    if ! curl -s -L -H 'Cache-Control: no-cache' -o "${V2RAY}geoip.dat.new" "$DOWNLOAD_LINK_GEOIP"; then
         echo 'error: Download failed! Please check your network or try again.'
         exit 1
     fi
-    if ! curl -L -H 'Cache-Control: no-cache' -o "${V2RAY}geoip.dat.sha256sum.new" "$DOWNLOAD_LINK_GEOIP.sha256sum"; then
+    if ! curl -s -L -H 'Cache-Control: no-cache' -o "${V2RAY}geoip.dat.sha256sum.new" "$DOWNLOAD_LINK_GEOIP.sha256sum"; then
         echo 'error: Download failed! Please check your network or try again.'
         exit 1
     fi
@@ -43,11 +43,11 @@ download_geoip() {
 }
 
 download_geosite() {
-    if ! curl -L -H 'Cache-Control: no-cache' -o "${V2RAY}geosite.dat.new" "$DOWNLOAD_LINK_GEOSITE"; then
+    if ! curl -s -L -H 'Cache-Control: no-cache' -o "${V2RAY}geosite.dat.new" "$DOWNLOAD_LINK_GEOSITE"; then
         echo 'error: Download failed! Please check your network or try again.'
         exit 1
     fi
-    if ! curl -L -H 'Cache-Control: no-cache' -o "${V2RAY}geosite.dat.sha256sum.new" "$DOWNLOAD_LINK_GEOSITE.sha256sum"; then
+    if ! curl -s -L -H 'Cache-Control: no-cache' -o "${V2RAY}geosite.dat.sha256sum.new" "$DOWNLOAD_LINK_GEOSITE.sha256sum"; then
         echo 'error: Download failed! Please check your network or try again.'
         exit 1
     fi