update

docs/_preused.md

@@ -0,0 +1,15 @@
+---
+search:
+    exclude: true
+---
+
+
+!!! tip "If you bought PiKVM on Amazon or pre-used..."
+
+    Sometimes Amazon's fullfilmet may send you a device that has been returned by another customer.
+    It doesn't mean that the device is broken, it just didn't fit him.
+    However the PiKVM OS will contain configuration changes from previous user and already generated encryption keys.
+
+    When buying on Amazon or pre-used devices (for example on eBay), we strongly recommend flashing the memory card
+    with a new clean PiKVM OS. It's very easy to do and won't take much time.
+    [See the details here.](flashing_os.md)

docs/v3.md

@@ -96,7 +96,10 @@ Once you have that, do the following:
 -----
 ## Flashing the OS
 
-Most of the time, this step is not necessary. However, if there is a possibility that your device had a previous owner (e.g. "Used - Like New" on Amazon), we recommend reflashing the OS to ensure a clean start. Please follow [this guide](flashing_os.md).
+Most of the time, this step is not necessary.
+
+{!_preused.md!}
+
 
 -----
 ## Wiring

docs/v4.md

@@ -81,7 +81,9 @@ PiKVM uses your remote keyboard and mouse to simulate a local keyboard, mouse, a
 -----
 ## Flashing the OS
 
-Most of the time, this step is not necessary. However, if there is a possibility that your device had a previous owner (e.g. "Used - Like New" on Amazon), we recommend reflashing the OS to ensure a clean start. Please follow [this guide](flashing_os.md).
+Most of the time, this step is not necessary.
+
+{!_preused.md!}
 
 -----
 ## Wiring