diff --git a/.travis.yml b/.travis.yml
index d751251ccc2..746c6c68701 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -212,7 +212,7 @@ before_script:
         # We need the official upstream for comparison
         git remote add upstream https://github.com/moodle/moodle.git;
 
-        git fetch upstream master;
+        git fetch upstream MOODLE_310_STABLE;
         export GIT_PREVIOUS_COMMIT="`git merge-base FETCH_HEAD $TRAVIS_COMMIT`";
         export GIT_COMMIT="$TRAVIS_COMMIT";
         export UPSTREAM_FETCH_HEAD=`git rev-parse FETCH_HEAD`
diff --git a/backup/backup.class.php b/backup/backup.class.php
index 54fca21ce78..3a57d0475eb 100644
--- a/backup/backup.class.php
+++ b/backup/backup.class.php
@@ -160,7 +160,7 @@ abstract class backup implements checksumable {
     /**
      * Usually same than major release zero version, mainly for informative/historic purposes.
      */
-    const RELEASE = '4.0';
+    const RELEASE = '3.10';
 
     /**
      * Cipher to be used in backup and restore operations.
diff --git a/lib/environmentlib.php b/lib/environmentlib.php
index 64a3a4ffed9..df11fa907b9 100644
--- a/lib/environmentlib.php
+++ b/lib/environmentlib.php
@@ -368,7 +368,7 @@ function get_latest_version_available($version, $env_select) {
         return false;
     }
 /// First we look for exact version
-    if (in_array($version, $versions)) {
+    if (in_array($version, $versions, true)) {
         return $version;
     } else {
         $found_version = false;
@@ -416,7 +416,7 @@ function get_environment_for_version($version, $env_select) {
     }
 
 /// If the version requested is available
-    if (!in_array($version, $versions)) {
+    if (!in_array($version, $versions, true)) {
         return false;
     }
 
@@ -808,8 +808,15 @@ function environment_check_moodle($version, $env_select) {
     $release = get_config('', 'release');
     $current_version = normalize_version($release);
     if (strpos($release, 'dev') !== false) {
-        // when final version is required, dev is NOT enough!
-        $current_version = $current_version - 0.1;
+        // When final version is required, dev is NOT enough so, at all effects
+        // it's like we are running the previous version.
+        $versionarr = explode('.', $current_version);
+        if (isset($versionarr[1]) and $versionarr[1] > 0) {
+            $versionarr[1]--;
+            $current_version = implode('.', $versionarr);
+        } else {
+            $current_version = $current_version - 0.1;
+        }
     }
 
 /// And finally compare them, saving results
diff --git a/lib/tests/setuplib_test.php b/lib/tests/setuplib_test.php
index 1e6c3b37c76..3e00f6bc148 100644
--- a/lib/tests/setuplib_test.php
+++ b/lib/tests/setuplib_test.php
@@ -43,7 +43,7 @@ class core_setuplib_testcase extends advanced_testcase {
         } else {
             $docroot = $CFG->docroot;
         }
-        $this->assertRegExp('~^' . preg_quote($docroot, '') . '/\d{2}/' . current_language() . '/course/editing$~',
+        $this->assertRegExp('~^' . preg_quote($docroot, '') . '/\d{2,3}/' . current_language() . '/course/editing$~',
                 get_docs_url('course/editing'));
     }
 
diff --git a/version.php b/version.php
index 6c761f6a13a..3e57c1c7964 100644
--- a/version.php
+++ b/version.php
@@ -32,6 +32,6 @@ defined('MOODLE_INTERNAL') || die();
 $version  = 2020081400.00;              // YYYYMMDD      = weekly release date of this DEV branch.
                                         //         RR    = release increments - 00 in DEV branches.
                                         //           .XX = incremental changes.
-$release  = '4.0dev (Build: 20200814)'; // Human-friendly version name
-$branch   = '40';                       // This version's branch.
+$release  = '3.10dev (Build: 20200814)';// Human-friendly version name
+$branch   = '310';                      // This version's branch.
 $maturity = MATURITY_ALPHA;             // This version's maturity level.