diff --git a/apkovl/etc/modprobe.d/g_mass_storage.conf b/apkovl/etc/modprobe.d/g_mass_storage.conf
new file mode 100644
index 0000000..cf8ee44
--- /dev/null
+++ b/apkovl/etc/modprobe.d/g_mass_storage.conf
@@ -0,0 +1 @@
+options g_mass_storage file=/dev/mmcblk0p1
diff --git a/apkovl/etc/modules-load.d/g_mass_storage.conf b/apkovl/etc/modules-load.d/g_mass_storage.conf
new file mode 100644
index 0000000..fd5ae93
--- /dev/null
+++ b/apkovl/etc/modules-load.d/g_mass_storage.conf
@@ -0,0 +1 @@
+g_mass_storage
diff --git a/bin/build b/bin/build
index 9fc57ec..20d98f5 100755
--- a/bin/build
+++ b/bin/build
@@ -11,5 +11,5 @@ mkdir dist
 bin/download "${version}" dist
 docker-compose run --rm minirootfs sh -c 'apk update && apk add'
 ssh-keygen -A -f apkovl
-cp -a cache dist
+cp -a usercfg.txt cache -t dist
 tar czf dist/localhost.apkovl.tar.gz --owner=0 --group=0 -C apkovl .
diff --git a/usercfg.txt b/usercfg.txt
new file mode 100644
index 0000000..dcff45e
--- /dev/null
+++ b/usercfg.txt
@@ -0,0 +1 @@
+dtoverlay=dwc2