diff --git a/.github/workflows/mikrotik_patch.yml b/.github/workflows/mikrotik_patch.yml
index d82e659..681078d 100644
--- a/.github/workflows/mikrotik_patch.yml
+++ b/.github/workflows/mikrotik_patch.yml
@@ -152,29 +152,50 @@ jobs:
                     ./new_iso
         sudo rm -rf ./new_iso
 
-    - name: Get install-image-${{ env.LATEST_VERSION }}.img
+    - name: Get chr-${{ env.LATEST_VERSION }}.img
       run: |
-        sudo wget -nv -O install-image-$LATEST_VERSION.zip https://download.mikrotik.com/routeros/$LATEST_VERSION/install-image-$LATEST_VERSION.zip
-
-    - name: Patch install-image-${{ env.LATEST_VERSION }}.img
+        sudo wget -nv -O chr-$LATEST_VERSION.img.zip https://download.mikrotik.com/routeros/$LATEST_VERSION/chr-$LATEST_VERSION.img.zip
+        sudo unzip chr-$LATEST_VERSION.img.zip
+        
+    - name: Patch chr-${{ env.LATEST_VERSION }}.img
       run: |
-        sudo unzip install-image-$LATEST_VERSION.zip  
-        sudo mkdir ./install
-        sudo mount -o loop install-image-$LATEST_VERSION.img ./install
-        sudo rm install-image-$LATEST_VERSION.zip
-        sudo rm ./install/1.npk
-        NPK_FILES=$(find ./install/*.npk)
-        for file in $NPK_FILES; do
-          sudo -E python3 npk.py sign $file $file
-        done
-        sudo cp routeros-$LATEST_VERSION.npk ./install/1.npk
-        sudo cp keygen.zip ./install/
-        sudo cp option-$LATEST_VERSION.npk ./install/100.npk
-        sudo cp python3-$LATEST_VERSION.npk ./install/101.npk
-        sudo cp linux ./install/
-        sudo umount ./install
-        sudo rm -rf ./install
-        sudo zip install-image-$LATEST_VERSION.zip ./install-image-$LATEST_VERSION.img
+        sudo apt -y install qemu-utils 2> /dev/null
+        sudo qemu-img convert -f raw -O qcow2 chr-$LATEST_VERSION.img chr-$LATEST_VERSION.qcow2
+        sudo rm chr-$LATEST_VERSION.img.zip
+        sudo rm chr-$LATEST_VERSION.img
+        sudo qemu-nbd -c /dev/nbd0 chr-$LATEST_VERSION.qcow2
+        sudo -E python3 patch.py boot /dev/nbd0p1
+        sudo mkdir ./routeros
+        sudo mount /dev/nbd0p2 ./routeros
+        sudo mkdir -p ./qcow2/routeros/rw/disk
+        sudo cp keygen.zip ./qcow2/routeros/rw/disk
+        sudo mkdir -p ./qcow2/routeros/var/pdb/option
+        sudo cp option-$LATEST_VERSION.npk ./qcow2/routeros/var/pdb/option/image
+        sudo cp routeros-$LATEST_VERSION.npk ./qcow2/routeros/var/pdb/system/image
+        sudo umount /dev/nbd0p2
+        sudo rm -rf ./routeros
+        sudo qemu-nbd -d /dev/nbd0
+
+        sudo qemu-img convert -f qcow2 -O vmdk chr-$LATEST_VERSION.qcow2 chr-$LATEST_VERSION.vmdk
+        sudo qemu-img convert -f qcow2 -O vpc chr-$LATEST_VERSION.qcow2 chr-$LATEST_VERSION.vhd
+        sudo qemu-img convert -f qcow2 -O vhdx chr-$LATEST_VERSION.qcow2 chr-$LATEST_VERSION.vhdx
+        sudo qemu-img convert -f qcow2 -O vdi chr-$LATEST_VERSION.qcow2 chr-$LATEST_VERSION.vdi
+        sudo qemu-img convert -f qcow2 -O raw chr-$LATEST_VERSION.qcow2 chr-$LATEST_VERSION.img
+
+        sudo zip chr-$LATEST_VERSION.qcow2.zip chr-$LATEST_VERSION.qcow2
+        sudo zip chr-$LATEST_VERSION.vmdk.zip chr-$LATEST_VERSION.vmdk
+        sudo zip chr-$LATEST_VERSION.vhd.zip chr-$LATEST_VERSION.vhd
+        sudo zip chr-$LATEST_VERSION.vhdx.zip chr-$LATEST_VERSION.vhdx
+        sudo zip chr-$LATEST_VERSION.vdi.zip chr-$LATEST_VERSION.vdi
+        sudo zip chr-$LATEST_VERSION.img.zip chr-$LATEST_VERSION.img
+
+        sudo rm chr-$LATEST_VERSION.qcow2
+        sudo rm chr-$LATEST_VERSION.vmdk
+        sudo rm chr-$LATEST_VERSION.vhd
+        sudo rm chr-$LATEST_VERSION.vhdx
+        sudo rm chr-$LATEST_VERSION.vdi
+        sudo rm chr-$LATEST_VERSION.img
+
 
     - name: Delete Release tag ${{ env.LATEST_VERSION }}
       run: |
@@ -200,5 +221,5 @@ jobs:
         make_latest:  ${{ matrix.channel == 'stable' }}
         files: |
           mikrotik-${{ env.LATEST_VERSION }}.iso
-          install-image-${{ env.LATEST_VERSION }}.zip
+          chr-${{ env.LATEST_VERSION }}.*.zip
           netinstall-${{ env.LATEST_VERSION }}.zip
\ No newline at end of file
diff --git a/patch.py b/patch.py
index 3b98f8e..70e5810 100644
--- a/patch.py
+++ b/patch.py
@@ -52,6 +52,42 @@ def run_shell_command(command):
     process = subprocess.run(command, shell=True, check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     return process.stdout, process.stderr
 
+
+def patch_bootloader(key_dict,boot_dev):
+    IMAGE_OFFSET_BLK = 512
+    BLOCK_SIZE = 4096
+    #debugfs /dev/sda1 -R 'icheck 512' 2> /dev/null | grep 512   
+    stdout,stderr = run_shell_command(f"debugfs {boot_dev} -R 'icheck {IMAGE_OFFSET_BLK}' 2> /dev/null | sed -n '2p'")
+    tmp = stdout.decode().strip().split('\t')
+    assert len(tmp) >= 2 , f'debugfs icheck error {tmp} {stderr.decode()}'
+    inode = int(tmp[1])
+    print(f'inode : {inode}')
+    #sudo debugfs /dev/sda1 -R 'stat <12>' 2> /dev/null | sed -n '11p' 
+    stdout,stderr = run_shell_command(f"debugfs /dev/sda1 -R 'stat <12>' 2> /dev/null | sed -n '11p' ")
+    blocks_info = stdout.decode().strip().split(',')
+    blocks = []
+    ind_block_id = None
+    for block_info in blocks_info:
+        _tmp = block_info.strip().split(':')
+        if _tmp[0].strip() == '(IND)':
+            ind_block_id =  int(_tmp[1])
+        else:
+            id_range = _tmp[0].strip().replace('(','').replace(')','').split('-')
+            block_range = _tmp[1].strip().replace('(','').replace(')','').split('-')
+            blocks += [id for id in range(int(block_range[0]),int(block_range[1])+1)]
+    print(f' blocks : {len(blocks)} ind_block_id : {ind_block_id}')
+    stdout,stderr = run_shell_command(f"debugfs /dev/sda1 -R 'cat <{inode}>' 2> /dev/null")
+    bzImage = stdout
+    new_bzImage = patch_bzimage(bzImage,key_dict)
+    print(f'write block {len(blocks)} : [',end="")
+    with open(boot_dev,'wb') as f:
+        for index,block_id in enumerate(blocks):
+            print('#',end="")
+            f.seek(block_id*BLOCK_SIZE)
+            f.write(new_bzImage[index*BLOCK_SIZE:(index+1)*BLOCK_SIZE])
+        f.flush()
+        print(']')
+
 def patch_squashfs(path,key_dict):
     for root, dirs, files in os.walk(path):
         for file in files:
@@ -108,6 +144,8 @@ if __name__ == '__main__':
     npk_parser = subparsers.add_parser('npk',help='patch and sign npk file')
     npk_parser.add_argument('input',type=str, help='Input file')
     npk_parser.add_argument('-o','--output',type=str,help='Output file')
+    boot_parser = subparsers.add_parser('boot',help='patch bootloader')
+    boot_parser.add_argument('dev',type=str, help='boot device')
     netinstall_parser = subparsers.add_parser('netinstall',help='patch netinstall file')
     netinstall_parser.add_argument('input',type=str, help='Input file')
     netinstall_parser.add_argument('-o','--output',type=str,help='Output file')
@@ -121,6 +159,9 @@ if __name__ == '__main__':
     if args.command =='npk':
         print(f'patching {args.input} ...')
         patch_npk_file(key_dict,kcdsa_private_key,eddsa_private_key,args.input,args.output)
+    if args.command =='boot':
+        print(f'patching {args.dev} ...')
+        patch_bootloader(key_dict,args.dev)
     elif args.command == 'netinstall':
         from netinstall import patch_netinstall
         print(f'patching {args.input} ...')