Amazons' Audiobooks malware

Hi All,

I'm a n00b at android, so apologies if I have posted to the wrong forum. I have a Chinese smartphone styled on a Samsung Galaxy S6 called an M6 (JIAKE) according to the phones information. It is running android 4.4.2. Yesterday, a whole load of apps/malware appeared. Mainly games which I 'force stopped' and 'disabled'. One very annoying one is the ad from Amazons' Audiobooks, inviting me to download their app. This keeps coming up on screen and locking the phone when I try to login to my Google account.

I removed the SD card and scanned it with ESETs' Smart Security 8. It found dozens of trojans!

I removed the sim card and inserted it in my old smartphone and this works perfectly. My M6 however still exhibits the same malware problem. I have completed a factory reset several times but cannot get rid of this audiobooks ad.

How do I get my phone back?

Cheers

Gary

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Amazons' Audiobooks malware