diff --git a/.github/workflows/mikrotik_patch_7.yml b/.github/workflows/mikrotik_patch_7.yml
index 9e32780..9e17e58 100644
--- a/.github/workflows/mikrotik_patch_7.yml
+++ b/.github/workflows/mikrotik_patch_7.yml
@@ -339,12 +339,14 @@ jobs:
           sudo cp ./chr/boot/EFI/BOOT/BOOTX64.EFI ./img/boot/EFI/BOOT/BOOTX64.EFI
           sudo umount /dev/nbd1p1
           sudo mount /dev/nbd1p2 ./chr/routeros/
-          sudo mkdir -p ./chr/routeros/var/pdb/{system,option}
+          sudo rm -rf ./chr/routeros/*
+          sudo mkdir -p ./chr/routeros/{var/pdb/{system,option},boot,rw}
           sudo cp ./all_packages/option-$LATEST_VERSION$ARCH.npk ./chr/routeros/var/pdb/option/image
           sudo cp ./all_packages/routeros-$LATEST_VERSION$ARCH.npk ./chr/routeros/var/pdb/system/image
           sudo umount /dev/nbd1p2
-          sudo rm -rf ./chr
+          sudo zerofree -v /dev/nbd1p2
           sudo qemu-nbd -d /dev/nbd1
+          sudo rm -rf ./chr
 
           sudo qemu-img convert -f raw -O qcow2 chr-$LATEST_VERSION$ARCH-legacy-bios.img chr-$LATEST_VERSION$ARCH-legacy-bios.qcow2
           sudo qemu-img convert -f raw -O vmdk chr-$LATEST_VERSION$ARCH-legacy-bios.img chr-$LATEST_VERSION$ARCH-legacy-bios.vmdk