China Mobile A4s Firmware Guide

You cannot simply copy firmware files to the SD card. You need specialized tools because the China Mobile A4s uses a Spreadtrum (Unisoc) SC9832E chipset.

You don't always need to flash the whole firmware. If your A4s is booting but slow, you can use the ADB (Android Debug Bridge) method to uninstall the carrier bloatware permanently for the current user. china mobile a4s firmware

The trick: Enable Developer Options (tap Build Number 7 times). Turn on USB Debugging. On your PC, run: You cannot simply copy firmware files to the SD card

adb shell pm uninstall -k --user 0 com.chinamobile.services
adb shell pm uninstall -k --user 0 com.mediatek.bluetooth
adb shell pm uninstall -k --user 0 com.android.stk

Note: Do not uninstall com.android.shell or com.mediatek.mtklogger or you will soft brick. Note: Do not uninstall com

This recovers about 200MB of RAM and stops the battery drain.

Because the device is carrier-branded, official firmware isn’t hosted on public OEM portals. Reliable sources include:

Important: Verify the PCB version and preloader checksum. Wrong firmware can hard-brick the device.