diff --git a/install.md b/install.md
index e346678..da1bb03 100644
--- a/install.md
+++ b/install.md
@@ -26,6 +26,19 @@ curl -fsSL https://gitea.dtext.online/obel1x/fedora-OEMDRV/raw/branch/main/syste
 sudo bash /tmp/install.sh
 ```
 
+## Run directly from another repository
+
+If you are on another fork or branch and you want to test your changes, do:
+
+```bash
+export REPO_URL="https://yourgitserver.tld/.../fedora-OEMDRV.git"
+export REPO_BRANCH="anotherbranch"
+curl -fsSL ${REPO_URL%.git}/raw/branch/${REPO_BRANCH}/system_setup/install.sh -o /tmp/install.sh
+sudo -E bash /tmp/install.sh
+```
+
+That way, install.sh should know what to pull.
+
 ## After the script completes
 
 Configure your environment before running any installation:
diff --git a/system_setup/install.sh b/system_setup/install.sh
index feb4072..5191cac 100755
--- a/system_setup/install.sh
+++ b/system_setup/install.sh
@@ -14,7 +14,8 @@ SHRINK_MIB=4096
 OEMDRV_LABEL="OEMDRV"
 MOUNT_POINT="/opt/sys_config"
 MOUNT_OPTS="compress=zstd:6"
-REPO_URL="${1:-https://gitea.dtext.online/obel1x/fedora-OEMDRV.git}"
+REPO_URL="${REPO_URL:-https://gitea.dtext.online/obel1x/fedora-OEMDRV.git}"
+REPO_BRANCH="${REPO_BRANCH:-main}"
 MIN_FREE_MIB=$(( SHRINK_MIB + 512 ))   # require 512 MiB headroom above the shrink size
 
 # ── Helpers ───────────────────────────────────────────────────────────────────
@@ -69,7 +70,7 @@ check_repo_url() {
 
     tmpdir=$(mktemp -d /tmp/oemdrv_repocheck.XXXXXX)
 
-    if ! curl -fsSL "${REPO_URL%.git}/raw/branch/main/system_setup/install.sh" \
+    if ! curl -fsSL "${REPO_URL%.git}/raw/branch/${REPO_BRANCH}/system_setup/install.sh" \
               -o "$tmpdir/install.sh" 2>/dev/null; then
         rm -rf "$tmpdir"
         return 1
@@ -293,13 +294,13 @@ info "Verifying repository URL..."
 check_repo_url
 case $? in
     1) echo
-       echo "WARNING: '$REPO_URL' is not a reachable git repository."
+       echo "WARNING: '$REPO_URL' branch '${REPO_BRANCH}' is not a reachable git repository."
        read -r -p "  Continue anyway? [y/N]: " ans
        [[ "${ans,,}" == "y" ]] || { echo "Aborted."; exit 0; }
        ;;
     2) echo
        echo "WARNING: The checksum of this script does not match 'system_setup/install.sh'"
-       echo "         at '$REPO_URL'."
+       echo "         at '$REPO_URL' branch '${REPO_BRANCH}'."
        echo "         You may be running an outdated or modified version of install.sh."
        read -r -p "  Continue anyway? [y/N]: " ans
        [[ "${ans,,}" == "y" ]] || { echo "Aborted."; exit 0; }
@@ -496,7 +497,7 @@ mount -o "$MOUNT_OPTS" "$OEMDRV_DEV" "$MOUNT_POINT" || die "mount failed."
 
 info "Cloning $REPO_URL into $MOUNT_POINT..."
 cd "$MOUNT_POINT" || die "Cannot cd to $MOUNT_POINT."
-git clone --progress --depth 1 "$REPO_URL" . || die "git clone failed."
+git clone --progress --depth 1 -b $REPO_BRANCH "$REPO_URL" . || die "git clone failed."
 
 # Write hardware UUID to a user-readable per-machine file
 dmidecode -t system | grep -i 'UUID' \
diff --git a/system_setup/install_from_repo.sh b/system_setup/install_from_repo.sh
deleted file mode 100755
index 5273ed6..0000000
--- a/system_setup/install_from_repo.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env sh
-# SPDX-FileCopyrightText: Daniel Pätzold
-# SPDX-License-Identifier: AGPL-3.0-or-later
-#
-# Fetches the installfile from a repository and runs it
-#
-REPO_URL="${1:-https://gitea.dtext.online/obel1x/fedora-OEMDRV.git}"
-REPO_BRANCH="${2:-main}"
-
-SCRIPTURL="${REPO_URL%.git}/raw/branch/${REPO_BRANCH}/system_setup/install.sh"
-echo "Fetching from ${SCRIPTURL} and running script with sudo"
-curl -fsSL ${SCRIPTURL} -o /tmp/install.sh && sudo bash /tmp/install.sh ${REPO_URL}