diff --git a/bbr.sh b/bbr.sh
index ec2d111..f1502e9 100644
--- a/bbr.sh
+++ b/bbr.sh
@@ -47,6 +47,14 @@ is_digit(){
     fi
 }
 
+is_64bit(){
+    if [ $(getconf WORD_BIT) = '32' ] && [ $(getconf LONG_BIT) = '64' ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
 get_valid_valname(){
     local val=${1}
     local new_val=$(eval echo $val | sed 's/[-.]/_/g')
@@ -117,7 +125,7 @@ version_ge(){
 }
 
 get_latest_version() {
-    latest_version=($(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/ | awk -F'\"v' '/v[4-9]./{print $2}' | cut -d/ -f1 | grep -v - | sort -V))
+    latest_version=($(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/ | awk -F'\"v' '/v[4-9]./{print $2}' | cut -d/ -f1 | grep -v - | sort -V))
 
     [ ${#latest_version[@]} -eq 0 ] && echo -e "${red}Error:${plain} Get latest kernel version failed." && exit 1
 
@@ -131,18 +139,18 @@ get_latest_version() {
     display_menu kernel last
 
     if [[ `getconf WORD_BIT` == "32" && `getconf LONG_BIT` == "64" ]]; then
-        deb_name=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)
-        deb_kernel_url="http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${deb_name}"
+        deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)
+        deb_kernel_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${deb_name}"
         deb_kernel_name="linux-image-${kernel}-amd64.deb"
-        modules_deb_name=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-modules" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)
-        deb_kernel_modules_url="http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${modules_deb_name}"
+        modules_deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-modules" | grep "generic" | awk -F'\">' '/amd64.deb/{print $2}' | cut -d'<' -f1 | head -1)
+        deb_kernel_modules_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${modules_deb_name}"
         deb_kernel_modules_name="linux-modules-${kernel}-amd64.deb"
     else
-        deb_name=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)
-        deb_kernel_url="http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${deb_name}"
+        deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-image" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)
+        deb_kernel_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${deb_name}"
         deb_kernel_name="linux-image-${kernel}-i386.deb"
-        modules_deb_name=$(wget -qO- http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-modules" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)
-        deb_kernel_modules_url="http://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${modules_deb_name}"
+        modules_deb_name=$(wget -qO- https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/ | grep "linux-modules" | grep "generic" | awk -F'\">' '/i386.deb/{print $2}' | cut -d'<' -f1 | head -1)
+        deb_kernel_modules_url="https://kernel.ubuntu.com/~kernel-ppa/mainline/v${kernel}/${modules_deb_name}"
         deb_kernel_modules_name="linux-modules-${kernel}-i386.deb"
     fi
 
@@ -221,9 +229,9 @@ install_elrepo() {
     rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
 
     if centosversion 6; then
-        rpm -Uvh http://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm
+        rpm -Uvh https://www.elrepo.org/elrepo-release-6-8.el6.elrepo.noarch.rpm
     elif centosversion 7; then
-        rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
+        rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
     fi
 
     if [ ! -f /etc/yum.repos.d/elrepo.repo ]; then
@@ -292,10 +300,36 @@ install_bbr() {
         install_elrepo
         [ ! "$(command -v yum-config-manager)" ] && yum install -y yum-utils > /dev/null 2>&1
         [ x"$(yum-config-manager elrepo-kernel | grep -w enabled | awk '{print $3}')" != x"True" ] && yum-config-manager --enable elrepo-kernel > /dev/null 2>&1
-        yum -y install kernel-ml kernel-ml-devel
-        if [ $? -ne 0 ]; then
-            echo -e "${red}Error:${plain} Install latest kernel failed, please check it."
-            exit 1
+        if centosversion 6; then
+            if is_64bit; then
+                rpm_kernel_name="kernel-ml-4.18.20-1.el6.elrepo.x86_64.rpm"
+                rpm_kernel_devel_name="kernel-ml-devel-4.18.20-1.el6.elrepo.x86_64.rpm"
+                rpm_kernel_url_1="http://repos.lax.quadranet.com/elrepo/archive/kernel/el6/x86_64/RPMS/"
+            else
+                rpm_kernel_name="kernel-ml-4.18.20-1.el6.elrepo.i686.rpm"
+                rpm_kernel_devel_name="kernel-ml-devel-4.18.20-1.el6.elrepo.i686.rpm"
+                rpm_kernel_url_1="http://repos.lax.quadranet.com/elrepo/archive/kernel/el6/i386/RPMS/"
+            fi
+            rpm_kernel_url_2="https://dl.lamp.sh/files/"
+            wget -c -t3 -T60 -O ${rpm_kernel_name} ${rpm_kernel_url_1}${rpm_kernel_name}
+            if [ $? -ne 0 ]; then
+                rm -rf ${rpm_kernel_name}
+                wget -c -t3 -T60 -O ${rpm_kernel_name} ${rpm_kernel_url_2}${rpm_kernel_name}
+            fi
+            wget -c -t3 -T60 -O ${rpm_kernel_devel_name} ${rpm_kernel_url_1}${rpm_kernel_devel_name}
+            if [ $? -ne 0 ]; then
+                rm -rf ${rpm_kernel_devel_name}
+                wget -c -t3 -T60 -O ${rpm_kernel_devel_name} ${rpm_kernel_url_2}${rpm_kernel_devel_name}
+            fi
+            [ -f ${rpm_kernel_name} ] && rpm -ivh ${rpm_kernel_name} || echo -e "${red}Error:${plain} Download ${rpm_kernel_name} failed, please check it."; exit 1
+            [ -f ${rpm_kernel_devel_name} ] && rpm -ivh ${rpm_kernel_devel_name} || echo -e "${red}Error:${plain} Download ${rpm_kernel_devel_name} failed, please check it."; exit 1
+            rm -f ${rpm_kernel_name} ${rpm_kernel_devel_name}
+        elif centosversion 7; then
+            yum -y install kernel-ml kernel-ml-devel
+            if [ $? -ne 0 ]; then
+                echo -e "${red}Error:${plain} Install latest kernel failed, please check it."
+                exit 1
+            fi
         fi
     elif [[ x"${release}" == x"debian" || x"${release}" == x"ubuntu" ]]; then
         [[ ! -e "/usr/bin/wget" ]] && apt-get -y update && apt-get -y install wget