Updating content to match V4

Author: Frank Delporte

content/about/download.md

@@ -6,6 +6,6 @@ weight: 45
 All downloads provided by the project can be found on [pi4j.com/download](https://pi4j.com/download/).
 
 The compiled artifacts (releases and snapshots) are available in the 
-[Sonatype Maven repository](https://oss.sonatype.org/index.html#nexus-search;gav~com.pi4j~~~~).
+[Maven Central Repository](https://central.sonatype.com/search?namespace=com.pi4j).
 
 <iframe src="https://pi4j.com/download" style="width: 100%; height: 100vh;"></iframe>

content/about/license.md

@@ -3,7 +3,7 @@ title: 'License (Open Source)'
 weight: 50
 ---
 
-The Pi4J Version 2.0 project is distributed and licensed under the **Apache License, Version 2.0** license 
+The Pi4J Version 2+ project is distributed and licensed under the **Apache License, Version 2.0** license 
 (_A business-friendly OSS license_).
 
 * [apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0)

content/getting-started/minimal-example-application.md

@@ -73,15 +73,16 @@ make the versions easy to update, we add those numbers as properties.
 ```xml
 <properties>
     <!-- DEPENDENCIES VERSIONS -->
-    <slf4j.version>2.0.16</slf4j.version>
-    <pi4j.version>2.7.0</pi4j.version>
+    <slf4j.version>2.0.17</slf4j.version>
+    <pi4j.version>4.0.0</pi4j.version>
 </properties>
 ``` 
 
 These are the dependencies we need:
 
 ```xml
 <dependencies>
+    <!-- Logging -->
     <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
@@ -93,22 +94,17 @@ These are the dependencies we need:
         <version>${slf4j.version}</version>
     </dependency>
 
-    <!-- include Pi4J Core -->
+    <!-- Include Pi4J Core -->
     <dependency>
         <groupId>com.pi4j</groupId>
         <artifactId>pi4j-core</artifactId>
         <version>${pi4j.version}</version>
     </dependency>
 
-    <!-- include Pi4J Plugins (Platforms and I/O Providers) -->
+    <!-- Include Pi4J Plugin (Platforms and I/O Providers) -->
     <dependency>
         <groupId>com.pi4j</groupId>
-        <artifactId>pi4j-plugin-raspberrypi</artifactId>
-        <version>${pi4j.version}</version>
-    </dependency>
-    <dependency>
-        <groupId>com.pi4j</groupId>
-        <artifactId>pi4j-plugin-gpiod</artifactId>
+        <artifactId>pi4j-plugin-ffm</artifactId>
         <version>${pi4j.version}</version>
     </dependency>
 </dependencies>
@@ -205,9 +201,9 @@ pi4j.shutdown();
 
 ```shell
 $ java -version
-openjdk version "17.0.7" 2023-04-18
-OpenJDK Runtime Environment (build 17.0.7+7-Debian-1deb11u1)
-OpenJDK 64-Bit Server VM (build 17.0.7+7-Debian-1deb11u1, mixed mode, sharing)
+openjdk version "25" 2025-09-16 LTS
+OpenJDK Runtime Environment Zulu25.28+85-CA (build 25+36-LTS)
+OpenJDK 64-Bit Server VM Zulu25.28+85-CA (build 25+36-LTS, mixed mode, sharing)
 ``` 
 
 * Download the project from GitHub and build it:
@@ -224,14 +220,12 @@ $ ./mvnw clean package
 $ cd target/distribution
 $ ls -l
 total 644
--rw-r--r-- 1 pi pi 344544 Oct 21 08:07 pi4j-core-2.7.0.jar
+-rw-r--r-- 1 pi pi 344544 Oct 21 08:07 pi4j-core-4.0.0.jar
 -rw-r--r-- 1 pi pi   7134 Oct 21 08:08 pi4j-example-minimal-0.0.1.jar
--rw-r--r-- 1 pi pi 158997 Oct 21 08:07 pi4j-library-gpiod-2.7.0.jar
--rw-r--r-- 1 pi pi  22633 Oct 21 08:07 pi4j-plugin-gpiod-2.7.0.jar
--rw-r--r-- 1 pi pi  28051 Oct 21 08:07 pi4j-plugin-raspberrypi-2.7.0.jar
+-rw-r--r-- 1 pi pi  22633 Oct 21 08:07 pi4j-plugin-ffm-4.0.0.jar
 -rwxr-xr-x 1 pi pi    101 Oct 21 08:08 run.sh
--rw-r--r-- 1 pi pi  69435 Oct 21 08:07 slf4j-api-2.0.16.jar
--rw-r--r-- 1 pi pi  15704 Oct 21 08:07 slf4j-simple-2.0.16.jar
+-rw-r--r-- 1 pi pi  69435 Oct 21 08:07 slf4j-api-2.0.17.jar
+-rw-r--r-- 1 pi pi  15704 Oct 21 08:07 slf4j-simple-2.0.17.jar
 ```
 
 * Start the application with the provided `run.sh` script:

content/prepare/_index.md

@@ -53,8 +53,8 @@ After these steps, you can continue to the [Getting Started with Pi4J](/getting-
 
 ## Pi4J OS
 
-In the past, we had our own Pi4J OS, based on Raspberry Pi OS with some extra preparations to make it easier to use with Pi4J. But because it became incompatible with the Raspberry Pi 5 and was difficult to maintain, we no longer will update that Pi4J OS.
+In the past, we had our own Pi4J OS, based on Raspberry Pi OS with some extra preparations to make it easier to use with Pi4J. But because it became incompatible with the Raspberry Pi 5 and was difficult to maintain, we don't provide a "full OS" anymore. The repository `pi4j-os` has been reworked and now contains scripts that make it easier to prepare a Raspberry Pi or other single-board computers for Java development and Pi4J.
 
 {{% notice tip %}}
-You can still find it on GitHub: [https://github.com/Pi4J/pi4j-os](https://github.com/Pi4J/pi4j-os)
+Check the info in the README in the repository at [github.com/Pi4J/pi4j-os](https://github.com/Pi4J/pi4j-os).
 {{% /notice %}}