diff --git a/readme.md b/readme.md
index d4c16f2..56fc390 100644
--- a/readme.md
+++ b/readme.md
@@ -2,14 +2,17 @@ this repo created in order to understand how Android build system actually works
 
 ## Manual Build simple hello world APK
 
-```powershell
-PS C:\Users\Kyouma\HelloJava> aapt2.exe link --manifest .\AndroidManifest.xml -I "C:\Android\platforms\android-31\android.jar" -o samplebuild.apk
-PS C:\Users\Kyouma\HelloJava> javac -bootclasspath "C:\Android\platforms\android-31\android.jar" -source 1.8 -target 1.8 .\src\dom\domain\*.java
-PS C:\Users\Kyouma\HelloJava> d8.bat .\src\dom\domain\SayingHello.class --lib "C:\Android\platforms\android-31\android.jar"
-PS C:\Users\Kyouma\HelloJava> zip -uj samplebuild.apk classes.dex
-PS C:\Users\Kyouma\HelloJava> zipalign.exe -p -f -v 4 .\samplebuild.apk aligned.apk
-PS C:\Users\Kyouma\HelloJava> keytool.exe -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000
-PS C:\Users\Kyouma\HelloJava> apksigner.bat sign --ks .\debug.keystore --ks-pass pass:android --out signed.apk .\aligned.apk
+- since d8 dexer [not support javac 21](https://code2care.org/java-jdk-21/fix-unsupported-major-minor-version-65-0-java-jdk-21/) yet, we need to lower the target and source
+- [stackoverflow](https://stackoverflow.com/questions/59895743/replacement-for-bootclasspath-option-in-java), use classpath instead of bootclasspath
+
+```shell
+aapt2 link --manifest AndroidManifest.xml -I "C:\Android\platforms\android-31\android.jar" -o samplebuild.apk
+javac -classpath "C:\Android\platforms\android-31\android.jar" -source 17 -target 17 src\dom\domain\*.java
+d8 src/dom/domain/SayingHello.class --lib "C:\Android\platforms\android-31\android.jar"
+zip -uj samplebuild.apk classes.dex
+zipalign -p -f -v 4 samplebuild.apk aligned.apk
+keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000
+apksigner sign --ks debug.keystore --ks-pass pass:android --out signed.apk aligned.apk
 ```
 
 These command will generate the following output:
@@ -27,21 +30,21 @@ These command will generate the following output:
 `baksmali dis classes.dex`, edit the string on generated `.smali`
 add modified dex to repatch the apk:
 
-```
-PS C:\Users\Kyouma\HelloJava> smali as ./out/dom/domain/SayingHello.smali -o classes.dex
-PS C:\Users\Kyouma\HelloJava> zip -uj samplebuild.apk classes.dex
-PS C:\Users\Kyouma\HelloJava> zipalign.exe -p -f -v 4 .\samplebuild.apk aligned.apk
-PS C:\Users\Kyouma\HelloJava> apksigner.bat sign --ks .\debug.keystore --ks-pass pass:android --out signed.apk .\aligned.apk
+```shell
+smali as out/dom/domain/SayingHello.smali -o classes.dex
+zip -uj samplebuild.apk classes.dex
+zipalign -p -f -v 4 samplebuild.apk aligned.apk
+apksigner sign --ks debug.keystore --ks-pass pass:android --out signed.apk aligned.apk
 ```
 
 ## Repatch other apk (telkomsel roli)
 
-```sh
-apktool.bat d telkomsel_roli.apk # modify smali stage
-apktool.bat b .\telkomsel_roli -o patched_roli.apk
-zipalign.exe -p -f -v 4 .\patched_roli.apk aligned_roli.apk
-apksigner.bat sign --ks .\debug.keystore --ks-pass pass:android --out final_roli.apk .\aligned_roli.apk # Make sure you've generated the keystore.
-adb install .\final_roli.apk # final signed patched  aligned apk
+```shell
+apktool d telkomsel_roli.apk # modify smali stage
+apktool b telkomsel_roli -o patched_roli.apk
+zipalign -p -f -v 4 patched_roli.apk aligned_roli.apk
+apksigner sign --ks debug.keystore --ks-pass pass:android --out final_roli.apk aligned_roli.apk # Make sure you've generated the keystore.
+adb install final_roli.apk # final signed patched  aligned apk
 ```
 
 ### [Other Link](https://www.facebook.com/permalink.php?story_fbid=pfbid06v2GZ6ctwsWStEkVt9KhYLzc3Gg8sQTpks9jqnFcEpJRKaiWepB45NxH4FbBDSMSl&id=100090321692618)