diff --git a/auto-krokodil.spec b/auto-krokodil.spec
index 48e7f86..435f3aa 100644
--- a/auto-krokodil.spec
+++ b/auto-krokodil.spec
@@ -3,8 +3,8 @@ Name: auto-krokodil
 Group: System/Kernel and hardware
 License: GPLv3
 Url: https://abf.io/import/auto-krokodil
-Version: 0.1
-Release: 2
+Version: 0.2
+Release: 1
 BuildArch: noarch
 # for php -l (syntax check)
 BuildRequires: /usr/bin/php
@@ -24,6 +24,8 @@ Source21: test.nvidia470.json
 Source22: LICENSE.nvidia-json
 Source23: test.spec.in
 
+Source31: krokodil-legacy-converter.php
+
 %description
 Scripts to automate packaging and installation of proprietary drivers for Nvidia GPUs
 
@@ -59,6 +61,21 @@ Generators of RPM provides for proprietary Nvidia drivers
 
 #----------------------------------------
 
+%package legacy-converter
+Summary: Convert JSON from newer Nvidia driver to an older one
+Requires: /usr/bin/php
+
+%description legacy-converter
+Old Nvidia drivers do not have a JSON with supported models,
+but JSONs of newer drivers specify GPUs supported by older drivers.
+This scripts takes a JSON from a newer driver and converts it
+into a JSON for an older driver which does not ship a native JSON.
+
+%files legacy-converter
+%{_bindir}/krokodil-legacy-converter
+
+#----------------------------------------
+
 %prep
 
 %build
@@ -73,9 +90,12 @@ install -m0755 %{SOURCE10} %{buildroot}%{_bindir}/krokodil-rpm-provides
 mkdir -p %{buildroot}%{_fileattrsdir}
 install -m0644 %{SOURCE11} %{buildroot}%{_fileattrsdir}/krokodilnvidia.attr
 
+install -m0755 %{SOURCE31} %{buildroot}%{_bindir}/krokodil-legacy-converter
+
 %check
 # check syntax
 /usr/bin/php -l %{buildroot}%{_bindir}/krokodil-rpm-provides
+/usr/bin/php -l %{buildroot}%{_bindir}/krokodil-legacy-converter
 
 # very basic check of the generator
 FILE="%{SOURCE21}" EVR=888-777 %{buildroot}%{_bindir}/krokodil-rpm-provides | grep -q '^nvidia-blob-devid(1f9d) = 888-777$'
diff --git a/krokodil-legacy-converter.php b/krokodil-legacy-converter.php
new file mode 100644
index 0000000..fba3bb5
--- /dev/null
+++ b/krokodil-legacy-converter.php
@@ -0,0 +1,57 @@
+#!/usr/bin/php
+
+<?php
+
+/* Old Nvidia drivers do not have a JSON with supported models,
+ * but JSONs of newer drivers specify GPUs supported by older drivers.
+ * This scripts takes a JSON from a newer driver and converts it
+ * into a JSON for an older driver which does not ship a native JSON. */
+
+define("EXIT_CODE_EINPUT", 10);
+define("EXIT_CODE_PARSEERROR", 20);
+
+$FILE = getenv("FILE");
+if (empty($FILE)) {
+	fwrite(STDERR, "Env FILE is not set! Set FILE=supported-gpus.json" . PHP_EOL);
+	exit(EXIT_CODE_EINPUT);
+}
+
+$BRANCH = getenv("BRANCH");
+if (empty($BRANCH)) {
+	fwrite(STDERR, "Env BRANCH is not set! Set e.g. ENV=390 to generate JSON for branch 390.xx" . PHP_EOL);
+	exit(EXIT_CODE_EINPUT);
+}	
+
+$data = file_get_contents($FILE);
+$array = json_decode($data);
+
+if (empty($array)) {
+	fwrite(STDERR, "Error decoding JSON from file " . $FILE . " !" . PHP_EOL);
+	exit(EXIT_CODE_EINPUT);
+}
+
+$chips_arr = array();
+
+foreach($array->chips as $chip) {
+	if (empty($chip->legacybranch))
+		continue;
+	// php 8+ has str_starts_with()
+	if (!(strpos($chip->legacybranch, $BRANCH . ".", 0) === 0))
+		continue;
+	// devid (Device ID) cannot be empty, other params can be empty
+	if (empty($chip->devid)) {
+		fwrite(STDERR, "Device ID cannot be empty!" . PHP_EOL);
+		exit(EXIT_CODE_PARSEERROR);
+	}
+	$arr = array("devid" => $chip->devid,
+				 "subdevid" => $chip->subdevid,
+				 "subvendorid" => $chip->subvendorid,
+				 "name" => $chip->name,
+				 "features" => $chip->features);
+	array_push($chips_arr, $arr);
+}
+
+$chips_arr = array("chips" => $chips_arr);
+echo json_encode($chips_arr);
+
+?>
diff --git a/krokodil-rpm-provides.php b/krokodil-rpm-provides.php
index 2c0024f..f1486c0 100644
--- a/krokodil-rpm-provides.php
+++ b/krokodil-rpm-provides.php
@@ -2,6 +2,9 @@
 
 <?php
 
+/* Proprietary Nvidia drivers ship JSONs which specify which GPUs
+ * are supported by the driver. This script creates RPM provides from it. */
+
 define("EXIT_CODE_EINPUT", 10);
 define("EXIT_CODE_PARSEERROR", 20);