How to make a custom VMOS ROM for VMOS Pro

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You must know the basics of the Android ROM structure, and also be able to manage the files, like editing build.prop, init.rc, copying files from flashable zip manually, etc. I will not explain in depth of it since there are plenty of infomation on XDA forum. Don’t worry, you don’t need any coding knowledge.

You CANNOT port other Android versions like Android 11, or use the ROM from other devices, than the VMOS provided. You would need a kernel source from VMOS, VM drivers sources, AOSP project sources to build and so on, and re-compile VMOS app to support it properly. It’s a lot harder than you think. If you need other Android version than the VMOS provided, consider sending a feedback to VMOS team. Please donot be that dumb. Dumb questions like this are subject to be ignored

Special thanks to 4pda forum for more info

Getting started

Get VMOS: https://www.vmos.com/ or https://www.vmos.cn/

Where to get the original ROM?
You can just backup your installed ROM and you will have a backed up zip file on /storage/emulated/0/vmospro/backup.
Your rom will be downloaded along the path /data/data/com.vmos.pro/rom/ No extension, this is a .7z archive.
And meta information along the path /data/data/com.vmos.pro/rom/rom_info/ Without extension, this is json.
If you have root, you can get original ROM files from /data/data/com.vmos.pro/rom, but the problem is the ROM is in .7z archive and you need to rezip it as .zip file. It is not recommended way to do and you will likely getting ROM installation error

Here’s how:
On the main screen, click the small settings icon of your ROM and choose System backup

Screenshot_20220212-212526.png

Start the backup. Let it run in foreground

Screenshot_20220212-212530.png

After it’s done, click OK

Screenshot_20220212-212712.png

You will see the backup on /storage/emulated/0/vmospro/backup

Screenshot_20220212-213436.png

Even modify on phone straight forward, without PC

Screenshot_20220212-213442.png

Enjoy modding!

Modifying ROM

  • Adding Google apps, root and Xposed**

I have uploaded my files that you can use to add files in the ROM

https://mega.nz/folder/WcZ3QZoA#Fcxjh2CsnPphBrJnyF31tw

Copying Google, Root and Xposed files to the ROM is pretty much straight forward

Root:
Recommended to use my modded Root. The package name has been changed to com.andnixshpmt1.superuser

In order to get root work, duplicate daemonsu to su and sx in xbin folder. I already did that in my modded Root

Cleaning up the file system
√ - The folder can be deleted
× - The folder cannot be deleted

acct √ - processor logs
data × - data section (you can clear its contents)
cache √ - OTA cache
config √ - don’t know, but you can delete
dev and mnt × - FS logs and something else (you can clear their contents)
oem √ - something related to OEM
sys √ - a folder for drivers but we don’t have them
system × - this is the system itself :D
storage × - the internal memory of Roma
sbin × - system binaries
root and proc √ - have nothing to do with root

Remove logging related
Delete files in system/bin

  1. bug report
  2. bugreportz
  3. dumpstate
  4. dumpsys
  5. logcat
  6. debuggerd
  7. debuggerd64
  8. logd
  9. logwrapper
  10. log

Delete files from system/etc/init

  1. atrace.rc
  2. debuggerd.rc
  3. debuggerd64.rc
  4. dumpstate.rc

Add lines to /system/build.prop

Code:

logcat.live=disable
dalvik.vm.checkjni=false
debugtool.anrhistory=0
profiler.debugmonitor=false
profiler.launch=false
profiler.hung.dumpdobugreport=false
persist.android.strictmode=0
ro.kernel.android.checkjni=0
ro.kernel.checkjni=0
profiler.forse_disable_err_rpt=1
profiler.forse_disable_ulog=1
dalvik.vm.verify-bytecode=false
ro.config.nocheckin=1
net.ipv4.tcp_no_metrics_save=1
ro.config.ksm.support=false
libc .debug.malloc=0
av.debug.disable.pers.cache=true
persist.vendor.ssr.enable_ramdumps=0

Removing Unwanted Apps:

SPOILER: REMOVING UNWANTED APPS

Android 4.4.4
system/app/BasicDreams.apk
system/app/BasicDreams.odex
system/app/Bluetooth.apk
system/app/Bluetooth.odex
system/app/Email.apk
system/app/Email.odex
system/app/Exchange2.apk
system /app/Exchange2.odex
system/app/Galaxy4.apk
system/app/Galaxy4.odex
system/app/HoloSpiralWallpaper.apk
system/app/HoloSpiralWallpaper.odex
system/app/HTMLViewer.apk
system/app/HTMLViewer.odex
system/app/VideoEditor.apk
system/app/VideoEditor.odex
system/app/QuickSearchBox.apk
system/app/QuickSearchBox.odex
system/app/PrintSpooler.apk
system/app/PrintSpooler.odex
system/app/PicoTts.apk
system/app /PicoTts.odex
system/app/Photable.apk
system/app/Photable.odex
system/app/PhaseBeam.apk
system/app/PhaseBeam.odex
system/app/NoiseField.apk
system/app/NoiseField.odex
system/app/OpenWnn.apk
system /app/OpenWnn.odex
system/app/PinyinIME.apk
system/app/PinyinIME.odex
system/app/MagicSmokeWallpapers.apk
system/app/MagicSmokeWallpapers.odex
system/app/WAPPushManager.apk
system/app/WAPPushManager.odex
system/app/VisualizationWallpapers.apk
system/app/VisualizationWallpapers.odex
system/priv-app/BackupRestoreConfirmation.apk
system/priv-app/Backup/RestoreConfirmation.odex
system/priv-app/Contacts.apk
system/priv-app/Contacts.odex
system/priv-app/ContactsProvider.apk
system/priv-app/ContactsProvider.odex
system/priv-app/Dialer.apk
system/priv-app/Dialer.odex
system/priv-app/Mms.apk
system/priv-app /Mms.odex
system/priv-app/SharedStorageBackup.apk
system/priv-app/SharedStorage/Backup.odex
system/priv-app/VoiceDialer.apk
system/priv-app/VoiceDialer.odex
system/priv-app/FusedLocation. apk
system/priv-app/FusedLocation.odex
system/priv-app/InputDevices.apk
system/priv-app/InputDevices.odex
system/priv-app/ProxyHandler.apk
system/priv-app/ProxyHandler.odex
system/priv- app/OneTimeInitializer.apk
system/priv-app/OneTimeInitializer.odex
system/priv-app/TeleService.apk
system/priv-app/TeleSercice.odex

Android 5.1.1
/system/app/CaptivePortalLogin
/system/app/com.baidu.input
/system/app/HTMLViewer
/system/app/via
/system/app/PicoTts
/system/app/PacProcessor
/system/priv-app/Contacts
/system /priv-app/ContactsProvider
/system/priv-app/Dialer
/system/priv-app/SharedStorageBackup
/system/priv-app/MmsService
/system/priv-app/FusedLocation
/system/priv-app/ProxyHandler
/system/priv -app/InputDevices
/system/priv-app/Telecom
/system/priv-app/TelephonyProvider
/system/priv-app/TeleService

Android 7.1.2
/system/app/BasicDreams
/system/app/CaptivePortalLogin
/system/app/CtsShimPrebuilt
/system/app/WallpaperBackup
/system/app/via
/system/app/PrintRecommendationService
/system/app/PhotoTable
/system/app/PacProcessor
/system/app/OpenWnn
/system/app/iflyime
/system/app/HTMLViewer
/system/priv-app/BackupRestoreConfirmation
/system/priv-app/BlockedNumberProvider
/system/priv-app/CtsShimPrivPrebuilt
/system/priv-app/StorageManager
/system /priv-app/SharedStorageBackup
/system/priv-app/TeleService
/system/priv-app/TelephonyProvider
/system/priv-app/Telecom
/system/priv-app/OneTimeInitializer
/system/priv-app/InputDevices
/system/priv-app/FusedLocation
/system/priv-app/ProxyHandler

Other garbage:

  • /system/tts (Android 7.1.2 speech synthesizer)
  • /system/xbin/dexlist (garbage file)
  • /system/etc/NOTICE.html.gz (Android Licenses)
  • /system/etc/event-log-tags (Something strange)

Warning

Before you are sharing your rom, make sure to delete data folder since it may contain sensitive data. It is important you DO NOT store any sensitive data in VMOS whatsoever. I’m not responsible if your data got stolen

Installing ROM

To install your custom ROM, click on 3 dots and choose Import local ROM. I’m not sure what’s the difference between Rec the VM (Restore) and Import local ROM. I think it’s to fully preseve data

Screenshot_20220212-213506.png

Choose a file

Screenshot_20220212-213515.png

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