Notice

You can generate your own keys yourself, but in this case you will have to manually create a MikroTik image.
It is easier to use previously generated keys. Here is the command to generate your own keys:

python3 license.py genkey

How to generate license key

• Install Python 3.x
• Clone this repository

RouterOS

Let's assume that your software_id is: 4JZ2-H049

loskiq@debian12:~# python3 license.py licgenros 4JZ2-H049 ${{ secrets.CUSTOM_LICENSE_PRIVATE_KEY }}
-----BEGIN MIKROTIK SOFTWARE KEY------------
50eNy667HxTQwmCtCpT15YaVx6lpPHQoy2w/KIsjoOHs
Eq/cU24G3/aIjHVeXXqjPRTubErxzaqjHD3aWIi1KA==
-----END MIKROTIK SOFTWARE KEY--------------
loskiq@debian12:~#

Cloud Hosted Router

Let's assume that your system_id is: pjLQ21gHzfI

loskiq@debian12:~# python3 license.py licgenchr pjLQ21gHzfI ${{ secrets.CUSTOM_LICENSE_PRIVATE_KEY }}
-----BEGIN MIKROTIK SOFTWARE KEY------------
hdMf+/8rDWLOCOuNt8qP82NgHbN8YdQfJcZNRyWzBerz
BfwOQF1ehUjNubOGkCf4zkPQrK7U+2hbM/uh7gJWGA==
-----END MIKROTIK SOFTWARE KEY--------------
loskiq@debian12:~#

Generate own images

Requirements

Debian 12

apt-get update
apt-get install -y wget curl mkisofs xorriso sudo zip unzip git squashfs-tools \
rsync ca-certificates python3 python3-pefile qemu-utils extlinux dosfstools --no-install-recommends

Download dependencies

export VERSION="7.16.2"

wget https://download.mikrotik.com/routeros/$VERSION/mikrotik-$VERSION.iso
wget https://download.mikrotik.com/routeros/$VERSION/install-image-$VERSION.zip
wget https://download.mikrotik.com/routeros/$VERSION/chr-$VERSION.img.zip
wget https://nchc.dl.sourceforge.net/project/refind/0.14.2/refind-bin-0.14.2.zip
git clone -b main --single-branch --depth=1 https://github.com/loskiq/MikroTikPatch
unzip install-image-$VERSION.zip
unzip chr-$VERSION.img.zip
unzip refind-bin-0.14.2.zip refind-bin-0.14.2/refind/refind_x64.efi
cp mikrotik-$VERSION.iso ./MikroTikPatch/mikrotik.iso
cp install-image-$VERSION.img ./MikroTikPatch/install-image.img
cp chr-$VERSION.img ./MikroTikPatch/chr.img
cd ./MikroTikPatch

Patch ISO

mkdir ./iso 
mount -o loop,ro mikrotik.iso ./iso
mkdir ./new_iso
cp -r ./iso/* ./new_iso/
rsync -a ./iso/ ./new_iso/
umount ./iso
rm -rf ./iso
mv ./new_iso/routeros-$VERSION.npk ./
python3 patch.py npk routeros-$VERSION.npk
NPK_FILES=$(find ./new_iso/*.npk)
for file in $NPK_FILES; do
  python3 npk.py sign $file $file
done
cp routeros-$VERSION.npk ./new_iso/
mkdir ./efiboot
mount -o loop ./new_iso/efiboot.img ./efiboot
python3 patch.py kernel ./efiboot/linux.x86_64
cp ./efiboot/linux.x86_64 ./BOOTX64.EFI
cp ./BOOTX64.EFI ./new_iso/isolinux/linux
umount ./efiboot
mkisofs -o mikrotik-$VERSION.iso \
  -V "MikroTik $VERSION x86" \
  -sysid "" -preparer "MiKroTiK" \
  -publisher "" -A "MiKroTiK RouterOS" \
  -input-charset utf-8 \
  -b isolinux/isolinux.bin \
  -c isolinux/boot.cat \
  -no-emul-boot \
  -boot-load-size 4 \
  -boot-info-table \
  -eltorito-alt-boot \
  -e efiboot.img \
  -no-emul-boot \
  -R -J \
  ./new_iso
rm -rf ./efiboot
mkdir ./all_packages
cp ./new_iso/*.npk ./all_packages/
rm -rf ./new_iso
cd ./all_packages
zip ../all_packages-x86-$VERSION.zip *.npk
cd ..

Patch install-image

cp install-image.img install-image-$VERSION.img
modprobe nbd
qemu-nbd -c /dev/nbd0 -f raw install-image-$VERSION.img
mkdir ./install-image
mount /dev/nbd0 ./install-image
cp ../refind-bin-0.14.2/refind/refind_x64.efi ./install-image/EFI/BOOT/BOOTX64.EFI
cp ./BOOTX64.EFI ./install-image/linux
NPK_FILES=($(find ./all_packages/*.npk))
for ((i=1; i<=${#NPK_FILES[@]}; i++))
do
  echo "${NPK_FILES[$i-1]}=>$i.npk" 
  cp ${NPK_FILES[$i-1]} ./install-image/$i.npk
done
umount /dev/nbd0
qemu-nbd -d /dev/nbd0
rm -rf ./install-image

qemu-img convert -f raw -O qcow2 install-image-$VERSION.img install-image-$VERSION.qcow2
qemu-img convert -f raw -O vmdk install-image-$VERSION.img install-image-$VERSION.vmdk
qemu-img convert -f raw -O vpc install-image-$VERSION.img install-image-$VERSION.vhd
qemu-img convert -f raw -O vhdx install-image-$VERSION.img install-image-$VERSION.vhdx
qemu-img convert -f raw -O vdi install-image-$VERSION.img install-image-$VERSION.vdi

Patch Cloud Hosted Router

cp chr.img chr-$VERSION.img
modprobe nbd
qemu-nbd -c /dev/nbd0 -f raw chr-$VERSION.img
mkdir -p ./chr/{boot,routeros}
mount /dev/nbd0p1 ./chr/boot/
mkdir -p ./chr/boot/BOOT
cp ./BOOTX64.EFI ./chr/boot/EFI/BOOT/BOOTX64.EFI
extlinux --install -H 64 -S 32 ./chr/boot/BOOT
echo -e "default system\nlabel system\n\tkernel /EFI/BOOT/BOOTX64.EFI\n\tappend load_ramdisk=1 root=/dev/ram0 quiet" > syslinux.cfg
cp syslinux.cfg ./chr/boot/BOOT/
rm syslinux.cfg
umount /dev/nbd0p1
mount /dev/nbd0p2 ./chr/routeros/
cp ./all_packages/routeros-$VERSION.npk ./chr/routeros/var/pdb/system/image
umount /dev/nbd0p2
qemu-nbd -d /dev/nbd0
rm -rf ./chr

qemu-img convert -f raw -O qcow2 chr-$VERSION.img chr-$VERSION.qcow2
qemu-img convert -f raw -O vmdk chr-$VERSION.img chr-$VERSION.vmdk
qemu-img convert -f raw -O vpc chr-$VERSION.img chr-$VERSION.vhd
qemu-img convert -f raw -O vhdx chr-$VERSION.img chr-$VERSION.vhdx
qemu-img convert -f raw -O vdi chr-$VERSION.img chr-$VERSION.vdi

Patch Netinstall

wget https://download.mikrotik.com/routeros/$VERSION/netinstall-$VERSION.zip
unzip netinstall-$VERSION.zip
python3 patch.py netinstall netinstall.exe
zip netinstall-$VERSION.zip netinstall.exe
rm netinstall-$VERSION.zip netinstall.exe LICENSE.txt

Patch MIPSBE

wget https://download.mikrotik.com/routeros/$VERSION/routeros-$VERSION-mipsbe.npk
wget https://download.mikrotik.com/routeros/$VERSION/all_packages-mipsbe-$VERSION.zip
mkdir ./all_packages-mipsbe
unzip all_packages-mipsbe-$VERSION.zip -d ./all_packages-mipsbe/
python3 patch.py npk routeros-$VERSION-mipsbe.npk
mv routeros-$VERSION-mipsbe.npk routeros-$VERSION-mipsbe.npk
rm all_packages-mipsbe-$VERSION.zip
NPK_FILES=$(find ./all_packages-mipsbe/*.npk)
for file in $NPK_FILES; do
  python3 npk.py sign $file $file
done
cd ./all_packages-mipsbe
zip ../all_packages-mipsbe-$VERSION.zip *.npk
cd ../
rm -rf ./all_packages-mipsbe

Similarly for ARM, ARM64 and other architectures.