[Q] Allwinner A23 with preinstalled Virus topic

Hello there,

I have bought an Allwinner A23 7" Tablet from Amazon: www . amazon . de/gp/product/B00KD930W8
The hardware works fine, but there are Virus and Adware in the ROM, identified by Sophos anti virus tool

• com.android.server - Andr/Closer-A


• Google - Andr/Sivu-A


• service provider (Adware)


• com.softwinner.videotest (Low reputation app)


• DragonFire-v2.3 (Low reputation app)


• DragonPhone (Low reputation app)

Sophos doesn't remove that and it's still there after wiping to factory settings.
When I open the built in Browser app, it's start page is always some other website, not possible to change that.
From time to time random ads pop up out of nowhere.


While booting, it shows a PHROG7 logo, not sure if it's relevant.

Model number: P7-0001X-TP
Processor type: DualCore-A23
Android version: 4.4.2
Firmware version: 4.4v2.0
Kernel version: 3.4.39 lpp@Android #273 Sat Aug 2 12:17:58 CST 2014
Build number: polaris_p1-eng 4.4.2 KVT49L 20140802 test-keys

Q1) Is there a way to get rid of that malware?
Q2) Where can I find a clean compatible ROM for this hardware (preferrable CM)
Q3) Which of the lots of HowTos is the correct one for me?