diff --git a/iridium_installer/backend/os_install.py b/iridium_installer/backend/os_install.py
index 8a01116..49828fb 100644
--- a/iridium_installer/backend/os_install.py
+++ b/iridium_installer/backend/os_install.py
@@ -76,10 +76,10 @@ def run_command(cmd, check=True):
 @contextmanager
 def mount_pseudo_fs(mount_root):
     """
-    Context manager to bind mount /dev, /proc, /sys, /run, and efivarfs into mount_root.
+    Context manager to bind mount /dev, /proc, /sys, and efivarfs into mount_root.
     """
     logger.info(f"Mounting pseudo-filesystems to {mount_root}...")
-    mounts = ["dev", "proc", "sys", "run"]
+    mounts = ["dev", "proc", "sys"]
     mounted_paths = []
 
     try:
@@ -230,7 +230,7 @@ def install_minimal_os(mount_root, releasever=None):
         "coreutils",
         "kernel",
         "systemd",
-        "systemd-boot",
+        "systemd-boot-unsigned",
         "dnf",
         "shadow-utils",
         "util-linux",
@@ -251,6 +251,7 @@ def install_minimal_os(mount_root, releasever=None):
             f"--repofrompath=iridium-iso,{iso_repo}",
             "--enablerepo=iridium-iso",
             "--nogpgcheck",
+            "--cacheonly",
             "--setopt=iridium-iso.gpgcheck=0",
             "--setopt=metadata_expire=-1",
         ]
@@ -270,11 +271,13 @@ def install_minimal_os(mount_root, releasever=None):
         "-y",
         f"--installroot={mount_root}",
         f"--releasever={releasever}",
-        "--use-host-config",
         "--setopt=install_weak_deps=False",
         "--nodocs",
     ]
     
+    if not iso_repo:
+        cmd.append("--use-host-config")
+        
     cmd += dnf_args + packages
 
     with mount_pseudo_fs(mount_root):