Samsung Galaxy Y SCH-i509 (China): can't write in /system/app
I've a Chinese version of the Samsung Galaxy Y SCH-i509 that doesn't come with any Google app/services/framework as it's always the case with Chinese versions of Android. My goal was to install these Google app/services/framework so here's what I tried:
I transfer via USB the Google Installer (谷歌应用下载器) apk to the SD card and installed it. Via the Google Installer, I install Gmail and Play store. You get the message that the Google Service Framework needs to be installed but the installation fails.
I manually transfer via USB the GoogleServicesFramework apk to the SD card and try to copy/paste it via ES File Explorer to /system/app but it fails, saying "unable to write the source file".
I root the phone following this tutorial
. I check that the phone is rooted via RootValidator: OK.
I install the mount /system (rw /ro) apk and select "Mount r/w"
In ES File Explorer, I check the properties of the folder /system/app: the folder is "Writable".
I try to copy/paste the GoogleServicesFramework apk via ES File Explorer to /system/app but it fails, saying "unable to write the source file".
I don't understand why.
At this point, I'm thinking to look for a custom ROM to install but can't find any on Internet for my model of phone.
I also can't find the Chinese stock ROM.
The related information I found about this phone is always for Indonesian or Indian versions, not for the Chinese one.
Can someone help me to achieve what I want, i.e being able to write in /system/app in order to copy/paste the GoogleServicesFramework apk? Or suggesting me an English custom ROM?