diff --git a/build.gradle b/build.gradle
index 933573b1..420c0452 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,6 +10,20 @@ application {
 
 repositories {
     mavenCentral()
+    google()
+    ivy {
+        name 'dex2jarV24Release'
+        url 'https://github.com/pxb1988/dex2jar/releases/download'
+        patternLayout {
+            artifact 'v[revision]/[artifact]-v[revision].[ext]'
+        }
+        metadataSources {
+            artifact()
+        }
+        content {
+            includeModule 'com.googlecode.dex2jar', 'dex-tools'
+        }
+    }
     maven {
         url 'https://repo.lanink.com/repository/maven-public/'
     }
@@ -28,15 +42,35 @@ repositories {
 configurations {
     // Isolated classpath for the forked codegen JVM (the :codegen subproject + JavaParser).
     codegenClasspath
+    // The official v2.4 distribution is not published as a Maven module.
+    dex2jarV24Distribution
 }
 
+def dex2jarV24Directory = file("$buildDir/dependencies/dex2jar-v2.4")
+def dex2jarV24Jars = [
+        'd2j-base-cmd-v2.4.jar',
+        'dex-ir-v2.4.jar',
+        'dex-reader-api-v2.4.jar',
+        'dex-reader-v2.4.jar',
+        'dex-tools-v2.4.jar',
+        'dex-translator-v2.4.jar',
+        'dex-writer-v2.4.jar',
+        'asm-9.5.jar',
+        'asm-analysis-9.5.jar',
+        'asm-commons-9.5.jar',
+        'asm-tree-9.5.jar',
+        'asm-util-9.5.jar'
+]
+def dex2jarV24ArchiveSha256 = 'ee7c45eb3c1d2474a6145d8d447e651a736a22d9664b6d3d3be5a5a817dda23a'
+
 dependencies {
     codegenClasspath project(':codegen')
+    dex2jarV24Distribution('com.googlecode.dex2jar:dex-tools:2.4@zip') {
+        transitive = false
+    }
 
-    // https://repo.lanink.cn/#browse/browse:maven-public:cn/nukkit/Nukkit/MOT-SNAPSHOT
-    /*implementation (group: 'cn.nukkit', name: 'Nukkit', version: 'MOT-20240213.074103-139') {
-        exclude group: 'org.apache.logging.log4j', module: 'log4j-slf4j-impl'
-    }*/
+    // The repository POM is packaging=pom, so the JAR artifact must be explicit.
+    implementation 'com.reider745.nukkit-mot:Nukkit-MOT:1.5.0-SNAPSHOT@jar'
 
     // https://mvnrepository.com/artifact/org.jetbrains/annotations
     implementation 'org.jetbrains:annotations:26.0.1'
@@ -47,12 +81,18 @@ dependencies {
     // https://central.sonatype.com/artifact/org.json/json/versions
     implementation group: 'org.json', name: 'json', version: '20231013'
 
+    implementation 'com.cedarsoftware:json-io:4.9.12'
+    implementation fileTree(dir: dex2jarV24Directory, include: '*.jar')
+    implementation 'org.javassist:javassist:3.29.1-GA'
+
+    // Generated API-only Android compatibility stubs. This is the only
+    // intentionally vendored JAR; rebuild it with rebuildAndroidStubs.
+    implementation files('iclibs/android.jar')
+    compileOnly 'com.android.support:support-annotations:25.3.1'
+
     compileOnly("org.projectlombok:lombok:1.18.44")
     annotationProcessor("org.projectlombok:lombok:1.18.44")
 
-    implementation fileTree (dir: 'iclibs', include: '*.jar')
-    implementation fileTree (dir: 'iclibs/dex2jar', include: '*.jar')
-
     testImplementation(platform("org.junit:junit-bom:5.10.0"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
@@ -78,7 +118,9 @@ jar {
     manifest {
         attributes 'Main-Class': application.mainClass
     }
-    from configurations.compileClasspath.collect { it.isDirectory() ? it : zipTree(it) }
+    from {
+        configurations.compileClasspath.collect { it.isDirectory() ? it : zipTree(it) }
+    }
 }
 
 run {
@@ -96,6 +138,40 @@ def apiGenOutputDir = layout.projectDirectory.dir('src/main/java/com/zhekasmirno
 def apiGenSourceTestRoot = file('src/test/java/org/innercore')
 def apiGenOutputTestDir = layout.projectDirectory.dir('src/test/java/com/zhekasmirnov/innercore/api/gen')
 
+tasks.register('prepareDex2jarV24', Sync) {
+    group = 'build setup'
+    description = 'Downloads and extracts the exact dex2jar v2.4 libraries used by the legacy build.'
+
+    def distribution = configurations.dex2jarV24Distribution
+    inputs.files(distribution)
+    from {
+        distribution.collect { zipTree(it) }
+    }
+    include dex2jarV24Jars.collect { "**/lib/$it" }
+    eachFile { details ->
+        details.path = details.name
+    }
+    includeEmptyDirs = false
+    into dex2jarV24Directory
+
+    doFirst {
+        def archive = distribution.singleFile
+        def checksumProperty = 'dex2jarV24ArchiveSha256Actual'
+        ant.checksum(file: archive, algorithm: 'SHA-256', property: checksumProperty)
+        def actualSha256 = ant.project.properties[checksumProperty]
+        if (actualSha256 != dex2jarV24ArchiveSha256) {
+            throw new GradleException("Unexpected dex2jar v2.4 archive SHA-256: $actualSha256")
+        }
+    }
+
+    doLast {
+        def missing = dex2jarV24Jars.findAll { !file("$dex2jarV24Directory/$it").isFile() }
+        if (!missing.isEmpty()) {
+            throw new GradleException("dex2jar v2.4 archive is missing expected libraries: $missing")
+        }
+    }
+}
+
 tasks.register('generateApiBindingsTest', JavaExec) {
     group = 'codegen'
     description = 'Generates JS binding base classes from @ApiBinding-annotated sources.'
@@ -129,7 +205,7 @@ tasks.register('generateApiBindings', JavaExec) {
 }
 
 tasks.named('compileJava') {
-    dependsOn 'generateApiBindings'
+    dependsOn 'generateApiBindings', 'prepareDex2jarV24'
 }
 
 task rebuildAndroidStubs(type: JavaExec, dependsOn: classes) {
@@ -178,4 +254,4 @@ publishing {
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/iclibs/Nukkit-MOT-SNAPSHOT.jar b/iclibs/Nukkit-MOT-SNAPSHOT.jar
deleted file mode 100644
index 16b72046..00000000
Binary files a/iclibs/Nukkit-MOT-SNAPSHOT.jar and /dev/null differ
diff --git a/iclibs/README.md b/iclibs/README.md
new file mode 100644
index 00000000..8651a0e6
--- /dev/null
+++ b/iclibs/README.md
@@ -0,0 +1,17 @@
+# Android compatibility stubs
+
+This directory intentionally contains only `android.jar`, a generated set of
+API-only Android compatibility stubs required to compile and run the legacy
+Inner Core API on the standalone server.
+
+The stubs can be regenerated from a locally supplied Android API input with:
+
+```shell
+./gradlew rebuildAndroidStubs
+```
+
+The input file is expected at `.todo/android.jar` and is excluded from Git.
+All other project dependencies are resolved from the remote repositories
+declared in `build.gradle` and must not be vendored here. The legacy dex2jar
+libraries are extracted into `build/dependencies` from the checksum-pinned
+official v2.4 release during the build.
diff --git a/iclibs/android-support-multidex.jar b/iclibs/android-support-multidex.jar
deleted file mode 100644
index 92c2c8ec..00000000
Binary files a/iclibs/android-support-multidex.jar and /dev/null differ
diff --git a/iclibs/android-support-v4.jar b/iclibs/android-support-v4.jar
deleted file mode 100644
index 10ff45ae..00000000
Binary files a/iclibs/android-support-v4.jar and /dev/null differ
diff --git a/iclibs/android-support-v7-recyclerview.jar b/iclibs/android-support-v7-recyclerview.jar
deleted file mode 100644
index d01b2068..00000000
Binary files a/iclibs/android-support-v7-recyclerview.jar and /dev/null differ
diff --git a/iclibs/desugar_jdk_libs-1.0.10.jar b/iclibs/desugar_jdk_libs-1.0.10.jar
deleted file mode 100644
index f2d003bf..00000000
Binary files a/iclibs/desugar_jdk_libs-1.0.10.jar and /dev/null differ
diff --git a/iclibs/dex2jar/asm-9.5.jar b/iclibs/dex2jar/asm-9.5.jar
deleted file mode 100644
index f5701dca..00000000
Binary files a/iclibs/dex2jar/asm-9.5.jar and /dev/null differ
diff --git a/iclibs/dex2jar/asm-analysis-9.5.jar b/iclibs/dex2jar/asm-analysis-9.5.jar
deleted file mode 100644
index 3385bff9..00000000
Binary files a/iclibs/dex2jar/asm-analysis-9.5.jar and /dev/null differ
diff --git a/iclibs/dex2jar/asm-commons-9.5.jar b/iclibs/dex2jar/asm-commons-9.5.jar
deleted file mode 100644
index 21898dfd..00000000
Binary files a/iclibs/dex2jar/asm-commons-9.5.jar and /dev/null differ
diff --git a/iclibs/dex2jar/asm-tree-9.5.jar b/iclibs/dex2jar/asm-tree-9.5.jar
deleted file mode 100644
index 5c6da657..00000000
Binary files a/iclibs/dex2jar/asm-tree-9.5.jar and /dev/null differ
diff --git a/iclibs/dex2jar/asm-util-9.5.jar b/iclibs/dex2jar/asm-util-9.5.jar
deleted file mode 100644
index f059066c..00000000
Binary files a/iclibs/dex2jar/asm-util-9.5.jar and /dev/null differ
diff --git a/iclibs/dex2jar/d2j-base-cmd-v2.4.jar b/iclibs/dex2jar/d2j-base-cmd-v2.4.jar
deleted file mode 100644
index 459c5f41..00000000
Binary files a/iclibs/dex2jar/d2j-base-cmd-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/dex-ir-v2.4.jar b/iclibs/dex2jar/dex-ir-v2.4.jar
deleted file mode 100644
index 5dbb4af7..00000000
Binary files a/iclibs/dex2jar/dex-ir-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/dex-reader-api-v2.4.jar b/iclibs/dex2jar/dex-reader-api-v2.4.jar
deleted file mode 100644
index f367f8b1..00000000
Binary files a/iclibs/dex2jar/dex-reader-api-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/dex-reader-v2.4.jar b/iclibs/dex2jar/dex-reader-v2.4.jar
deleted file mode 100644
index 5d7519be..00000000
Binary files a/iclibs/dex2jar/dex-reader-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/dex-tools-v2.4.jar b/iclibs/dex2jar/dex-tools-v2.4.jar
deleted file mode 100644
index 860b1c35..00000000
Binary files a/iclibs/dex2jar/dex-tools-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/dex-translator-v2.4.jar b/iclibs/dex2jar/dex-translator-v2.4.jar
deleted file mode 100644
index 15369cd4..00000000
Binary files a/iclibs/dex2jar/dex-translator-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/dex-writer-v2.4.jar b/iclibs/dex2jar/dex-writer-v2.4.jar
deleted file mode 100644
index 1bd986e8..00000000
Binary files a/iclibs/dex2jar/dex-writer-v2.4.jar and /dev/null differ
diff --git a/iclibs/dex2jar/open-source-license.txt b/iclibs/dex2jar/open-source-license.txt
deleted file mode 100644
index e8669c54..00000000
--- a/iclibs/dex2jar/open-source-license.txt
+++ /dev/null
@@ -1,67 +0,0 @@
-==== dx-*.jar
-Apache 2.0 http://www.apache.org/licenses/LICENSE-2.0.html
-
-
-==== antlr-*.jar
-[The BSD License]
-Copyright (c) 2003-2007, Terence Parr
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-* Redistributions of source code must retain the above copyright
-  notice, this list of conditions and the following disclaimer.
-* Redistributions in binary form must reproduce the above copyright
-  notice, this list of conditions and the following disclaimer in
-  the documentation and/or other materials provided with the
-  distribution.
-* Neither the name of the author nor the names of its contributors
-  may be used to endorse or promote products derived from this
-  software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-
-
-==== asm-*.jar
-
- ASM: a very small and fast Java bytecode manipulation framework
- Copyright (c) 2000-2005 INRIA, France Telecom
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
- 3. Neither the name of the copyright holders nor the names of its
-    contributors may be used to endorse or promote products derived from
-    this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- THE POSSIBILITY OF SUCH DAMAGE.
-
diff --git a/iclibs/glide-3.6.0.jar b/iclibs/glide-3.6.0.jar
deleted file mode 100644
index 13ce8f95..00000000
Binary files a/iclibs/glide-3.6.0.jar and /dev/null differ
diff --git a/iclibs/javassist.jar b/iclibs/javassist.jar
deleted file mode 100644
index 9035cdf8..00000000
Binary files a/iclibs/javassist.jar and /dev/null differ
diff --git a/iclibs/json-io.jar b/iclibs/json-io.jar
deleted file mode 100644
index 9e00ebfb..00000000
Binary files a/iclibs/json-io.jar and /dev/null differ
diff --git a/iclibs/recyclerview-1.1.0.jar b/iclibs/recyclerview-1.1.0.jar
deleted file mode 100644
index c703ef41..00000000
Binary files a/iclibs/recyclerview-1.1.0.jar and /dev/null differ
diff --git a/iclibs/reflections.jar b/iclibs/reflections.jar
deleted file mode 100644
index c2556418..00000000
Binary files a/iclibs/reflections.jar and /dev/null differ
diff --git a/iclibs/support-annotations-25.3.1.jar b/iclibs/support-annotations-25.3.1.jar
deleted file mode 100644
index cf84b573..00000000
Binary files a/iclibs/support-annotations-25.3.1.jar and /dev/null differ
diff --git a/iclibs/zip4j.jar b/iclibs/zip4j.jar
deleted file mode 100644
index c0b03953..00000000
Binary files a/iclibs/zip4j.jar and /dev/null differ
diff --git a/src/main/java/com/zhekasmirnov/mcpe161/InnerCore.java b/src/main/java/com/zhekasmirnov/mcpe161/InnerCore.java
index 7d431d74..fc9acfd2 100644
--- a/src/main/java/com/zhekasmirnov/mcpe161/InnerCore.java
+++ b/src/main/java/com/zhekasmirnov/mcpe161/InnerCore.java
@@ -28,7 +28,6 @@ import java.util.List;
 
 public class InnerCore {
     public static final String LOGGER_TAG = "INNERCORE-LAUNHER";
-    public static final boolean isLicenceVersion = false;
 
     private static InnerCore instance;
     private static JavaEnvironment javaEnvironment;
@@ -62,7 +61,7 @@ public class InnerCore {
     }
 
     public static boolean checkLicence(Activity activity) {
-        return !isLicenceVersion;
+        throw new UnsupportedOperationException("InnerCore.checkLicence(activity)");
     }
 
     public void load() {