diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67c91bd..3eeec1e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -77,6 +77,7 @@ For major (breaking) changes - **version 4, 3 and 2** - see end of page.
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
+| 5.7.3          | 2021-05-26     | `osInfo()` improved UEFI detection (windows) |
 | 5.7.2          | 2021-05-24     | `system()` virtual detection improvement |
 | 5.7.1          | 2021-05-20     | `graphics()` Check for qwMemorySize on Windows |
 | 5.7.0          | 2021-05-20     | `diskLayout()` added smartdata for win (if istalled) |
diff --git a/docs/history.html b/docs/history.html
index 1c10a63..52910df 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -56,6 +56,11 @@
                   </tr>
                 </thead>
                 <tbody>
+                  <tr>
+                    <th scope="row">5.7.3</th>
+                    <td>2021-05-26</td>
+                    <td><span class="code">osInfo()</span> improved UEFI detection (windows)</td>
+                  </tr>
                   <tr>
                     <th scope="row">5.7.2</th>
                     <td>2021-05-24</td>
diff --git a/docs/index.html b/docs/index.html
index 302d7ea..b7aea19 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -170,7 +170,7 @@
       <img class="logo" src="assets/logo.png">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span>&nbsp;</div>
-      <div class="version">New Version: <span id="version">5.7.2</span></div>
+      <div class="version">New Version: <span id="version">5.7.3</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
diff --git a/lib/osinfo.js b/lib/osinfo.js
index 5e06acd..47ee62f 100644
--- a/lib/osinfo.js
+++ b/lib/osinfo.js
@@ -384,13 +384,13 @@ function isUefiWindows() {
         exec('findstr /C:"Detected boot environment" "%windir%\\Panther\\setupact.log"', util.execOptsWin, function (error, stdout) {
           if (!error) {
             const line = stdout.toString().split('\n\r')[0];
-            resolve(line.toLowerCase().indexOf('uefi') >= 0);
+            resolve(line.toLowerCase().indexOf('uefi') >= 0 || line.toLowerCase().indexOf(' efi') >= 0);
             return;
           } else {
-            exec('$env:firmware_type', util.execOptsWin, function (error, stdout) {
+            exec('echo %firmware_type%', util.execOptsWin, function (error, stdout) {
               if (!error) {
                 const line = stdout.toString() || '';
-                resolve(line.toLowerCase().indexOf('uefi') >= 0);
+                resolve(line.toLowerCase().indexOf('efi') >= 0);
               }
               resolve(false);
             });