diff --git a/README.md b/README.md
index 258a502..dae2d65 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ This tool focuses on editing Android boot.img(also recovery.img, and vbmeta.img)
 ## 1. Prerequisite
 #### 1.1 Host OS requirement:
 
-Linux or Mac development env. To get the most of the toolkit, following packages are also needed: python, jdk 8+, zlib1g-dev, cpio, device-tree-compiler.
+![Linux](doc/linux24.png) or ![Mac](doc/apple24.png) development env. To get the most of the toolkit, following packages are also needed: python, jdk 8+, zlib1g-dev, cpio, device-tree-compiler.
 
 #### 1.2 Target Android requirement:
 
@@ -34,6 +34,10 @@ Clone this repo with minimal depth:
 
     git clone https://github.com/cfig/Android_boot_image_editor.git --depth=1
 
+or clone it from mirror:
+
+    git clone https://gitee.com/cfig/Android_boot_image_editor.git --depth=1
+
 Put your boot.img to current directory, then start gradle 'unpack' task:
 
     cp <original_boot_image> boot.img
diff --git a/aosp/libavb1.2/src/avb/c/avb_sysdeps_posix.c b/aosp/libavb1.2/src/avb/c/avb_sysdeps_posix.c
index e26c3ef..f1572a5 100644
--- a/aosp/libavb1.2/src/avb/c/avb_sysdeps_posix.c
+++ b/aosp/libavb1.2/src/avb/c/avb_sysdeps_posix.c
@@ -22,7 +22,11 @@
  * SOFTWARE.
  */
 
+#if defined(__APPLE__) && defined(__MACH__)
+#include <machine/endian.h>
+#else
 #include <endian.h>
+#endif
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/aosp/libsparse/append2simg/build.gradle.kts b/aosp/libsparse/append2simg/build.gradle.kts
index 8249e94..5484028 100644
--- a/aosp/libsparse/append2simg/build.gradle.kts
+++ b/aosp/libsparse/append2simg/build.gradle.kts
@@ -12,3 +12,7 @@ application {
 tasks.withType(LinkExecutable::class.java).configureEach {
     linkerArgs.add("-lz")
 }
+
+tasks.withType(CppCompile::class.java).configureEach {
+    compilerArgs.add("-std=c++17")
+}
diff --git a/aosp/libsparse/base/build.gradle.kts b/aosp/libsparse/base/build.gradle.kts
index f3e15d6..92a1fe4 100644
--- a/aosp/libsparse/base/build.gradle.kts
+++ b/aosp/libsparse/base/build.gradle.kts
@@ -12,3 +12,7 @@ extensions.configure<CppLibrary> {
     privateHeaders.from(file("src/main/headers"))
     publicHeaders.from(file("src/main/public"))
 }
+
+tasks.withType(CppCompile::class.java).configureEach {
+    compilerArgs.add("-std=c++17")
+}
diff --git a/aosp/libsparse/img2simg/build.gradle.kts b/aosp/libsparse/img2simg/build.gradle.kts
index 8249e94..5484028 100644
--- a/aosp/libsparse/img2simg/build.gradle.kts
+++ b/aosp/libsparse/img2simg/build.gradle.kts
@@ -12,3 +12,7 @@ application {
 tasks.withType(LinkExecutable::class.java).configureEach {
     linkerArgs.add("-lz")
 }
+
+tasks.withType(CppCompile::class.java).configureEach {
+    compilerArgs.add("-std=c++17")
+}
diff --git a/aosp/libsparse/simg2img/build.gradle.kts b/aosp/libsparse/simg2img/build.gradle.kts
index d8e587c..3cf339c 100644
--- a/aosp/libsparse/simg2img/build.gradle.kts
+++ b/aosp/libsparse/simg2img/build.gradle.kts
@@ -15,3 +15,7 @@ tasks.withType(LinkExecutable::class.java).configureEach {
 
 tasks.register<CppCompile>("hello") {
 }
+
+tasks.withType(CppCompile::class.java).configureEach {
+    compilerArgs.add("-std=c++17")
+}
diff --git a/aosp/libsparse/simg2simg/build.gradle.kts b/aosp/libsparse/simg2simg/build.gradle.kts
index 8249e94..5484028 100644
--- a/aosp/libsparse/simg2simg/build.gradle.kts
+++ b/aosp/libsparse/simg2simg/build.gradle.kts
@@ -12,3 +12,7 @@ application {
 tasks.withType(LinkExecutable::class.java).configureEach {
     linkerArgs.add("-lz")
 }
+
+tasks.withType(CppCompile::class.java).configureEach {
+    compilerArgs.add("-std=c++17")
+}
diff --git a/aosp/mkbootfs.10/build.gradle b/aosp/mkbootfs.10/build.gradle
index 0c8f4a7..f792d7c 100644
--- a/aosp/mkbootfs.10/build.gradle
+++ b/aosp/mkbootfs.10/build.gradle
@@ -1,10 +1,10 @@
-apply plugin: 'cpp' 
-apply plugin: 'c' 
+apply plugin: 'cpp'
+apply plugin: 'c'
 
 model {
     buildTypes {
         release
-    }   
+    }
 
     components {
         mkbootfs(NativeExecutableSpec) {
@@ -12,7 +12,7 @@ model {
                 cppCompiler.define "__ANDROID_VNDK__"
                 //cppCompiler.define 'CFIG_NO_FIX_STAT'
                 cppCompiler.args << "-Wno-write-strings"
-            }   
-        }   
-    }   
+            }
+        }
+    }
 }
diff --git a/aosp/mkbootfs.11/build.gradle b/aosp/mkbootfs.11/build.gradle
index 636dd65..c7b8efc 100644
--- a/aosp/mkbootfs.11/build.gradle
+++ b/aosp/mkbootfs.11/build.gradle
@@ -1,10 +1,10 @@
-apply plugin: 'cpp' 
-apply plugin: 'c' 
+apply plugin: 'cpp'
+apply plugin: 'c'
 
 model {
     buildTypes {
         release
-    }   
+    }
 
     components {
         mkbootfs(NativeExecutableSpec) {
@@ -12,8 +12,8 @@ model {
                 //cppCompiler.define "ANDROID"
                 //cppCompiler.define "ANDROID", "__ANDROID_VNDK__"
                 //cppCompiler.define 'CFIG_NO_FIX_STAT'
-                cppCompiler.args << '-std=c++17' << "-Wno-write-strings"
-            }   
-        }   
-    }   
+                cppCompiler.args << "-std=c++17" << "-Wno-write-strings"
+            }
+        }
+    }
 }
diff --git a/aosp/mkbootfs.11/src/mkbootfs/headers/utils/Compat.h b/aosp/mkbootfs.11/src/mkbootfs/headers/utils/Compat.h
index 6002567..e49120f 100644
--- a/aosp/mkbootfs.11/src/mkbootfs/headers/utils/Compat.h
+++ b/aosp/mkbootfs.11/src/mkbootfs/headers/utils/Compat.h
@@ -79,7 +79,7 @@ static inline int ftruncate64(int fd, off64_t length) {
 #ifndef TEMP_FAILURE_RETRY
 /* Used to retry syscalls that can return EINTR. */
 #define TEMP_FAILURE_RETRY(exp) ({         \
-    typeof (exp) _rc;                      \
+    decltype (exp) _rc;                    \
     do {                                   \
         _rc = (exp);                       \
     } while (_rc == -1 && errno == EINTR); \
diff --git a/doc/apple24.png b/doc/apple24.png
new file mode 100644
index 0000000..3b8b16c
Binary files /dev/null and b/doc/apple24.png differ
diff --git a/doc/linux24.png b/doc/linux24.png
new file mode 100644
index 0000000..f3bf519
Binary files /dev/null and b/doc/linux24.png differ
diff --git a/tools/gfw.sh b/tools/gfw.sh
new file mode 100755
index 0000000..dfc5b35
--- /dev/null
+++ b/tools/gfw.sh
@@ -0,0 +1,50 @@
+#! /bin/sh
+# speed up with mirrors within the biggest LAN
+
+git apply - <<EOF
+
+diff --git a/aosp/boot_signer/build.gradle.kts b/aosp/boot_signer/build.gradle.kts
+index 0472c6e..788257d 100644
+--- a/aosp/boot_signer/build.gradle.kts
++++ b/aosp/boot_signer/build.gradle.kts
+@@ -5,7 +5,8 @@ plugins {
+ }
+ 
+ repositories {
+-    jcenter()
++    maven { url = uri("http://maven.aliyun.com/nexus/content/groups/public/") }
++    maven { url = uri("http://maven.aliyun.com/nexus/content/repositories/jcenter") }
+ }
+ 
+ dependencies {
+diff --git a/bbootimg/build.gradle.kts b/bbootimg/build.gradle.kts
+index 3362dd7..9906c00 100644
+--- a/bbootimg/build.gradle.kts
++++ b/bbootimg/build.gradle.kts
+@@ -6,7 +6,8 @@ plugins {
+ }
+ 
+ repositories {
+-    jcenter()
++    maven { url = uri("http://maven.aliyun.com/nexus/content/groups/public/") }
++    maven { url = uri("http://maven.aliyun.com/nexus/content/repositories/jcenter") }
+ }
+ 
+ dependencies {
+diff --git a/build.gradle.kts b/build.gradle.kts
+index bf076be..973c84a 100644
+--- a/build.gradle.kts
++++ b/build.gradle.kts
+@@ -14,7 +14,8 @@ if (parseGradleVersion(gradle.gradleVersion) < 5) {
+ 
+ buildscript {
+     repositories {
+-        jcenter()
++        maven { url = uri("http://maven.aliyun.com/nexus/content/groups/public/") }
++        maven { url = uri("http://maven.aliyun.com/nexus/content/repositories/jcenter") }
+     }
+     dependencies {
+         classpath("org.apache.commons:commons-exec:1.3")
+
+EOF
+