diff --git a/fetchupd.php b/fetchupd.php
index 78f0bc0..ac9165f 100644
--- a/fetchupd.php
+++ b/fetchupd.php
@@ -21,6 +21,33 @@ require_once dirname(__FILE__).'/shared/cache.php';
 require_once dirname(__FILE__).'/shared/fileinfo.php';
 require_once dirname(__FILE__).'/listid.php';
 
+function uupApiPrivateParseFlags($str) {
+    $split = explode('+', $str);
+    $flags = [];
+
+    if(isset($split[1]))
+        $flags = explode(',', strtolower($split[1]));
+
+    return [$split[0], $flags];
+}
+
+function uupApiPrivateGetLatestBuild() {
+    $builds = array('22000.1');
+
+    $ids = uupListIds();
+    if(isset($ids['error'])) {
+        $ids['builds'] = array();
+    }
+
+    if(empty($ids['builds'])) {
+        $build = $builds[0];
+    } else {
+        $build = $ids['builds'][0]['build'];
+    }
+
+    return $build;
+}
+
 function uupFetchUpd(
     $arch = 'amd64',
     $ring = 'WIF',
@@ -38,20 +65,11 @@ function uupFetchUpd(
     $flight = ucwords(strtolower($flight));
     $flight = 'Active';
 
+    $buildWithFlags = $build;
+    [$build, $flags] = uupApiPrivateParseFlags($build);
+
     if($build == 'latest' || (!$build)) {
-        $builds = array('22000.1');
-
-        $ids = uupListIds();
-        if(isset($ids['error'])) {
-            $ids['builds'] = array();
-        }
-
-        if(empty($ids['builds'])) {
-            $build = $builds[0];
-        } else {
-            $build = $ids['builds'][0]['build'];
-        }
-        unset($builds, $ids);
+        $build = uupApiPrivateGetLatestBuild();
     }
 
     $build = explode('.', $build);
@@ -96,13 +114,13 @@ function uupFetchUpd(
         $type = 'Production';
     }
 
-    $res = "api-fetch-$arch-$ring-$flight-$build-$minor-$sku-$type";
+    $res = "api-fetch-$arch-$ring-$flight-$buildWithFlags-$minor-$sku-$type";
     $cache = new UupDumpCache($res);
     $fromCache = $cache->get();
     if($fromCache !== false) return $fromCache;
 
     consoleLogger('Fetching information from the server...');
-    $composerArgs = [$arch, $flight, $ring, $build, $sku, $type];
+    $composerArgs = [$arch, $flight, $ring, $build, $sku, $type, $flags];
     $out = sendWuPostRequestHelper('client', 'composeFetchUpdRequest', $composerArgs);
     if($out['error'] != 200) {
         consoleLogger('The request has failed');
@@ -130,7 +148,7 @@ function uupFetchUpd(
         $num++;
         consoleLogger("Checking build information for update {$num} of {$updatesNum}...");
 
-        $info = parseFetchUpdate($val, $out, $arch, $ring, $flight, $build, $sku, $type);
+        $info = parseFetchUpdate($val, $out, $arch, $ring, $flight, $build, $sku, $type, $flags);
         if(isset($info['error'])) {
             $errorCount++;
             continue;
@@ -160,7 +178,7 @@ function uupFetchUpd(
     return $data;
 }
 
-function parseFetchUpdate($updateInfo, $out, $arch, $ring, $flight, $build, $sku, $type) {
+function parseFetchUpdate($updateInfo, $out, $arch, $ring, $flight, $build, $sku, $type, $flags) {
     $updateNumId = preg_replace('/<UpdateInfo><ID>|<\/ID>.*/i', '', $updateInfo);
 
     $updates = preg_replace('/<Update>/', "\n<Update>", $out);
@@ -351,6 +369,10 @@ function parseFetchUpdate($updateInfo, $out, $arch, $ring, $flight, $build, $sku
             $temp['releasetype'] = $type;
         }
 
+        if(!empty($flags)) {
+            $temp['flags'] = $flags;
+        }
+
         $temp['created'] = time();
         $temp['sha256ready'] = true;
         $temp['files'] = $shaArray;
diff --git a/shared/main.php b/shared/main.php
index 655c417..ee39aa2 100644
--- a/shared/main.php
+++ b/shared/main.php
@@ -16,7 +16,7 @@ limitations under the License.
 */
 
 function uupApiVersion() {
-    return '1.42.1';
+    return '1.43.0-dev';
 }
 
 require_once dirname(__FILE__).'/auths.php';
diff --git a/shared/requests.php b/shared/requests.php
index 2465f43..e4cfb5e 100644
--- a/shared/requests.php
+++ b/shared/requests.php
@@ -16,7 +16,7 @@ limitations under the License.
 */
 
 // Composes DeviceAttributes parameter needed to fetch data
-function composeDeviceAttributes($flight, $ring, $build, $arch, $sku, $type) {
+function composeDeviceAttributes($flight, $ring, $build, $arch, $sku, $type, $flags) {
     $branch = branchFromBuild($build);
     $blockUpgrades = 0;
     $flightEnabled = 1;
@@ -216,11 +216,11 @@ function composeDeviceAttributes($flight, $ring, $build, $arch, $sku, $type) {
         'WuClientVer='.$build,
     );
 
-    if(uupApiConfigIsTrue('fetch_sync_current_only')) {
+    if(in_array('thisonly', $flags)) {
         $attrib[] = 'MediaBranch='.$branch;
     }
 
-    if($ring == 'MSIT' && uupApiConfigIsTrue('allow_corpnet')) {
+    if(in_array('corpnet', $flags) && uupApiConfigIsTrue('allow_corpnet')) {
         $attrib[] = 'DUInternal=1';
     }
 
@@ -316,7 +316,8 @@ function composeFileGetRequest($updateId, $info, $rev = 1, $type = 'Production')
         isset($info['checkBuild']) ? $info['checkBuild'] : '10.0.19041.1',
         isset($info['arch']) ? $info['arch'] : 'amd64',
         isset($info['sku']) ? $info['sku'] : 48,
-        $type
+        $type,
+        isset($info['flags']) ? $info['flags'] : [],
     );
 
     return <<<XML
@@ -360,7 +361,7 @@ XML;
 }
 
 // Composes POST data for fetching the latest update information from Windows Update
-function composeFetchUpdRequest($arch, $flight, $ring, $build, $sku = 48, $type = 'Production') {
+function composeFetchUpdRequest($arch, $flight, $ring, $build, $sku = 48, $type = 'Production', $flags = []) {
     $device = uupDevice();
     $encData = uupEncryptedData();
     $uuid = genUUID();
@@ -448,11 +449,11 @@ function composeFetchUpdRequest($arch, $flight, $ring, $build, $sku = 48, $type
         $build,
         $arch,
         $sku,
-        $type
+        $type,
+        $flags
     );
 
-    $syncCurrent = uupApiConfigIsTrue('fetch_sync_current_only');
-    $syncCurrentStr = $syncCurrent ? 'true' : 'false';
+    $syncCurrent = in_array('thisonly', $flags) ? 'true' : 'false';
 
     return <<<XML
 <s:Envelope xmlns:a="http://www.w3.org/2005/08/addressing" xmlns:s="http://www.w3.org/2003/05/soap-envelope">
@@ -575,7 +576,7 @@ function composeFetchUpdRequest($arch, $flight, $ring, $build, $sku = 48, $type
                 </ExtendedUpdateInfoParameters>
                 <ClientPreferredLanguages/>
                 <ProductsParameters>
-                    <SyncCurrentVersionOnly>$syncCurrentStr</SyncCurrentVersionOnly>
+                    <SyncCurrentVersionOnly>$syncCurrent</SyncCurrentVersionOnly>
                     <DeviceAttributes>$deviceAttributes</DeviceAttributes>
                     <CallerAttributes>$callerAttrib</CallerAttributes>
                     <Products>$products</Products>