Advan S4T is a cheap android smartphone that uses Spreadtrum SC7731C processor and Mali-400MP1 as GPU. These phones are often problematic on operating systems that are vulnerable to viruses. Not even a few who get error messages like "unfortunately google play service has stopped". If not fixed immediately, the phone will be bootloop or stuck on the logo.
How to fix that is by updating the firmware to refresh the operating system or patch bugs. Use the Spreadtrum Flash Tool to do it.
|Advan S4T With Flash Light
||Android 5.1 Lollipop
|Security Patch Level