diff --git a/reinstall.sh b/reinstall.sh
index 5f3243a..ac253a4 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -1622,15 +1622,13 @@ Continue with DD?
     }
 
     setos_fnos() {
-        if [ "$basearch" = aarch64 ]; then
-            error_and_exit "FNOS not supports ARM."
-        fi
-
         # 系统盘大小
         min=8
         default=8
+        echo "请输入系统分区大小，最小 $min GB，但可能无法更新系统。"
+        echo "Please input System Partition Size. Minimal is $min GB but may not be able to do system updates."
         while true; do
-            IFS= read -r -p "Type System Partition Size in GB. Minimal $min GB. [$default]: " input
+            IFS= read -r -p "Size in GB [$default]: " input
             input=${input:-$default}
             if ! { is_digit "$input" && [ "$input" -ge "$min" ]; }; then
                 error "Invalid Size. Please Try again."
@@ -1640,16 +1638,25 @@ Continue with DD?
             fi
         done
 
-        iso=$(curl -L https://fnnas.com/ | grep -o 'https://[^"]*\.iso' | head -1 | grep .)
+        if [ "$basearch" = aarch64 ]; then
+            if [ -z "$iso" ]; then
+                IFS= read -r -p "ISO Link: " iso
+                if [ -z "$iso" ]; then
+                    error_and_exit "ISO Link is empty."
+                fi
+            fi
+        else
+            iso=$(curl -L https://fnnas.com/ | grep -o -m1 'https://[^"]*\.iso')
 
-        # curl 7.82.0+
-        # curl -L --json '{"url":"'$iso'"}' https://www.fnnas.com/api/download-sign
+            # curl 7.82.0+
+            # curl -L --json '{"url":"'$iso'"}' https://www.fnnas.com/api/download-sign
 
-        iso=$(curl -L \
-            -d '{"url":"'$iso'"}' \
-            -H 'Content-Type: application/json' \
-            https://www.fnnas.com/api/download-sign |
-            grep -o 'https://[^"]*')
+            iso=$(curl -L \
+                -d '{"url":"'$iso'"}' \
+                -H 'Content-Type: application/json' \
+                https://www.fnnas.com/api/download-sign |
+                grep -o 'https://[^"]*')
+        fi
 
         test_url "$iso" iso
         eval "${step}_iso='$iso'"
diff --git a/trans.sh b/trans.sh
index a001c67..c7ae231 100644
--- a/trans.sh
+++ b/trans.sh
@@ -2523,15 +2523,18 @@ create_part() {
         sector_size=$(get_disk_logic_sector_size /dev/$xda)
         total_sector_count=$(get_disk_sector_count /dev/$xda)
 
-        # 截止最后一个分区的总扇区数（也就是总硬盘扇区数 - 备份分区表扇区数）
-        if is_efi; then
-            total_sector_count_except_backup_gpt=$((total_sector_count - 33))
-        else
+        # 截止最后一个分区的总扇区数（也就是总硬盘扇区数 - 备份分区表扇区数 - 备份 GPT Header）
+        if ! is_efi && ! is_xda_gt_2t; then
+            # mbr
             total_sector_count_except_backup_gpt=$total_sector_count
+        elif is_4kn; then
+            total_sector_count_except_backup_gpt=$((total_sector_count - 4 - 1))
+        else
+            total_sector_count_except_backup_gpt=$((total_sector_count - 32 - 1))
         fi
 
         # 向下取整 MiB
-        # gpt 最后 33 个扇区是备份分区表，不可用
+        # gpt 最后 33 (512n/512e) 或 5 (4Kn) 个扇区是备份分区表，不可用
         # parted 结束位置填 100% 时也会忽略最后不足 1MiB 的部分，我们模仿它
         max_can_use_m=$((total_sector_count_except_backup_gpt * sector_size / 1024 / 1024))
 
@@ -2560,9 +2563,20 @@ create_part() {
 
             mkfs.fat /dev/$xda*1                #1 efi
             mkfs.ext4 -F $ext4_opts /dev/$xda*2 #2 os + installer
+        elif is_xda_gt_2t; then
+            # bios > 2t
+            # 官方安装器是 mkpart BOOT 1M 100M，无论 esp 或者 bios_grub 都用这个分区和大小
+            parted /dev/$xda -s -- \
+                mklabel gpt \
+                mkpart BOOT ext4 1MiB 101MiB \
+                mkpart SYSTEM ext4 101MiB $os_part_end \
+                set 1 bios_grub on
+            update_part
+
+            echo                                #1 bios_boot
+            mkfs.ext4 -F $ext4_opts /dev/$xda*2 #2 os + installer
         else
             # bios
-            # 官方安装器不支持 bios + >2t
             parted /dev/$xda -s -- \
                 mklabel msdos \
                 mkpart primary 1MiB 101MiB \
@@ -4310,7 +4324,14 @@ install_fnos() {
     mkdir -p $initrd_dir
     (
         cd $initrd_dir
-        zcat /iso/install.amd/initrd.gz | cpio -idm
+        suffix=$(
+            case $(uname -m) in
+            x86_64) echo amd ;;
+            aarch64) echo a64 ;;
+            *) ;;
+            esac
+        )
+        zcat /iso/install.$suffix/initrd.gz | cpio -idm
     )
     apk del cpio
 
@@ -4346,8 +4367,11 @@ install_fnos() {
     # 挂载 proc sys dev
     mount_pseudo_fs /os
 
-    # 更新 initrd
-    # chroot $os_dir update-initramfs -u
+    # 更新 initrd，官方安装器也有这一步
+    # 理论上要设置 1777 权限，但飞牛官方安装器安装后不是
+    mkdir -p $os_dir/var/tmp
+    chmod 1777 $os_dir/var/tmp
+    chroot $os_dir update-initramfs -u
 
     # 更改密码
     if is_need_set_ssh_keys; then
@@ -4370,10 +4394,14 @@ install_fnos() {
         chroot $os_dir grub-install /dev/$xda
     fi
 
+    # grub 配置
+    # 取自 strings trim-install | grep GRUB_DISTRIBUTOR
+    sed -i 's/^GRUB_DISTRIBUTOR=.*/GRUB_DISTRIBUTOR="FNOS"/' $os_dir/etc/default/grub
+
     # grub tty
     ttys_cmdline=$(get_ttys console=)
-    echo GRUB_CMDLINE_LINUX=\"\$GRUB_CMDLINE_LINUX $ttys_cmdline\" \
-        >>$os_dir/etc/default/grub.d/tty.cfg
+    echo GRUB_CMDLINE_LINUX=\"\$GRUB_CMDLINE_LINUX $ttys_cmdline\" >$os_dir/etc/default/grub.d/tty.cfg
+
     chroot $os_dir update-grub
 
     # fstab
@@ -4382,8 +4410,9 @@ install_fnos() {
         uuid=$(lsblk /dev/$xda*2 -no UUID)
         echo "$fstab_line_os" | sed "s/%s/$uuid/"
 
+        # swapfile
         # 官方安装器即使 swapfile 设为 0 也会有这行
-        echo "$fstab_line_swapfile" | sed "s/%s/$uuid/"
+        echo "$fstab_line_swapfile"
 
         # /boot/efi
         if is_efi; then
@@ -5556,12 +5585,6 @@ is_list_has() {
     echo "$list" | grep -qFx "$item"
 }
 
-# hivexget 是 shell 脚本，开头是 #!/bin/bash
-# 但 alpine 没安装 bash，直接运行 hivexget 会报错
-hivexget() {
-    ash "$(which hivexget)" "$@"
-}
-
 get_windows_type_from_windows_drive() {
     local os_dir=$1