Monkey Virus. Popularly known as the auto-install virus. When your phone is infected you will expect the automatic installation of many unwanted applications when you are connected to the internet. Even if you hard reset it, it will not be fix. The only solution for now is to reprogram to its original stock ROM. Example is this ACER Liquid Z520 that I have received. The customer complains that whenever connected to his WiFi there are these continues pop ups applications that wants or probably force him to install mostly especially the popularly known as the sexy virus. The only way to solve it is to reprogram as what i have said.
How To Flash Acer Liquid Z520
1. Download Acer Liquid Z520 firmware
2. Download SP-Flash-Tool-v5.1532.00.
3. Open SP-Flash-Tool-v5.1532.00.
4. Click Scatter-loading, and browse for scatter file.
5. Select "Download Only"
6. Press Download.
7. Wait until finish.
