diff --git a/README.md b/README.md
index 6d06c6a93..6ccffa2f2 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,43 @@ https://telegra.ph/google-cloud-trans-key-04-26
 
 ## Compilation Guide
 
+**NOTE: Building on Windows is, unfortunately, not supported.
+Consider using a Linux VM or dual booting.**
+
+**Important:**
+
+1. Install Android Sdk and NDK ( default location is $HOME/Android/Sdk, otherwise you need to specify $ANDROID_HOME for it )
+
+It is recommended to use AndroidStudio to install.
+
+2. Install golang ( >= 1.15 ), and add GOPATH to the PATH variable.
+
+It is recommended to use gvm for the installation. if you are using the system package manager, don't forget to add environment variable.
+
+```shell
+apt install -y bison gcc make
+bash < <(curl -s -S -L https://raw.githubusercontent.com/moovweb/gvm/master/binscripts/gvm-installer)
+source "$HOME/.bashrc"
+
+gvm install go1.15 -B
+gvm use go1.15 --default
+```
+
+3. Install rust and its stdlib for android abis, add environment variables for it.
+
+It is recommended to use the official script, otherwise you may not find rustup.
+
+```shell
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+echo "source \$HOME/.cargo/env" >> $HOME/.bashrc && source $HOME/.cargo/env
+rustup target install armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
+```
+
+(One command at a time)
+
+4. Build native dependencies: `bin/native_libs.sh`
+5. Build external libraries and native code: `bin/update_libs.sh`
+
 ### Specify APP_ID and APP_HASH
 
 Fill out TELEGRAM_APP_ID and TELEGRAM_APP_HASH in local.properties
@@ -140,8 +177,7 @@ Available variant list:
 `Mini` ( without ss/ssr/v2ray proxies )  
   
 `AppleEmoji`  
-`NotoEmoji`  
-`FacebookEmoji`  
+`TwitterEmoji`
 `NoEmoji`
 
 ## Localization
diff --git a/TMessagesProj/build.gradle b/TMessagesProj/build.gradle
index 6b479af3f..d393d885f 100644
--- a/TMessagesProj/build.gradle
+++ b/TMessagesProj/build.gradle
@@ -1,12 +1,9 @@
-import cn.hutool.core.io.FileUtil
-import cn.hutool.json.JSONObject
-
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
-def verName = "7.2.1-rc01"
-def verCode = 102
+def verName = "7.2.1-rc03"
+def verCode = 108
 
 def serviceAccountCredentialsFile = rootProject.file("service_account_credentials.json")
 
@@ -32,11 +29,9 @@ void setupPlay(boolean beta) {
 
         track = beta ? "beta" : "production"
         defaultToAppBundles = true
-        userFraction = 1
 
     }
 
-
 }
 
 configurations {
@@ -44,24 +39,10 @@ configurations {
 }
 
 def okHttpVersion = '4.9.0'
-def fcmVersion = '20.3.0'
+def fcmVersion = '21.0.0'
 def crashlyticsVersion = '17.2.2'
 def playCoreVersion = '1.8.3'
 
-buildscript {
-
-    repositories {
-        jcenter()
-        mavenCentral()
-        google()
-    }
-
-    dependencies {
-        classpath 'cn.hutool:hutool-all:5.4.7'
-    }
-
-}
-
 repositories {
 
     jcenter()
@@ -116,7 +97,7 @@ dependencies {
     releaseImplementation "com.google.firebase:firebase-crashlytics:$crashlyticsVersion"
     releaseImplementation "com.google.android.play:core:$playCoreVersion"
 
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.0.10'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.0'
 
 }
 
@@ -129,7 +110,7 @@ android {
 
     defaultConfig {
         minSdkVersion 16
-        //noinspection OldTargetApi
+        //noinspection ExpiredTargetSdkVersion,OldTargetApi
         targetSdkVersion 28
 
         versionName verName
@@ -258,6 +239,7 @@ android {
         }
 
         release {
+            isDefault true
             debuggable false
             jniDebuggable false
             minifyEnabled true
@@ -327,6 +309,7 @@ android {
             versionNameSuffix '-mini-twitter-emoji'
         }
         full {
+            isDefault true
         }
         fullPlay {
             versionNameSuffix '-play'
diff --git a/build.gradle b/build.gradle
index 3b95bb706..fff6da2c4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,12 +7,12 @@ buildscript {
         maven { url "https://plugins.gradle.org/m2/" }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.2'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.10"
         classpath 'com.google.gms:google-services:4.3.4'
         classpath 'com.google.firebase:firebase-crashlytics-gradle:2.3.0'
         classpath 'gradle.plugin.org.mozilla.rust-android-gradle:plugin:0.8.3'
-        classpath 'com.github.triplet.gradle:play-publisher:2.8.0'
+        classpath 'com.github.triplet.gradle:play-publisher:3.0.0'
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 46a5a8ed9..087137a5a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-all.zip
+distributionUrl=https://services.gradle.org/distributions/gradle-6.7-all.zip
diff --git a/openpgp-api/build.gradle b/openpgp-api/build.gradle
index 76f1997bf..0fcad802d 100644
--- a/openpgp-api/build.gradle
+++ b/openpgp-api/build.gradle
@@ -13,5 +13,5 @@ android {
     lintOptions {
         abortOnError false
     }
-    buildToolsVersion '30.0.1'
+    buildToolsVersion '30.0.2'
 }
\ No newline at end of file
diff --git a/ss-rust/build.gradle.kts b/ss-rust/build.gradle.kts
index ce6ecf3c6..6312e112b 100644
--- a/ss-rust/build.gradle.kts
+++ b/ss-rust/build.gradle.kts
@@ -14,7 +14,7 @@ android {
         minSdkVersion(21)
         targetSdkVersion(30)
     }
-    buildToolsVersion = "30.0.1"
+    buildToolsVersion = "30.0.2"
 
 }
 
diff --git a/ssr-libev/build.gradle b/ssr-libev/build.gradle
index c8ead7008..a8ec2ab7a 100644
--- a/ssr-libev/build.gradle
+++ b/ssr-libev/build.gradle
@@ -4,7 +4,7 @@ plugins {
 
 android {
     compileSdkVersion 30
-    buildToolsVersion '30.0.1'
+    buildToolsVersion '30.0.2'
     ndkVersion rootProject.ext.ndkVersion
 
     defaultConfig {