I first executed those commands
adb push ApexLauncher.apk /system/app
adb shell chmod 644 /system/app/ApexLauncher.apk
adb push swiftkey.apk /system/app
adb shell chmod 644 /system/app/swiftkey.apk
PS : Rootexplorer installed via the command SuperUser of MtkDroidTools
Swiftkey did not work (bugged)
ApexLauncher worked (great, I have a now a launcher), so launched Rootexplorer, browser to TouchPal X Keyboard.apk install it, was able to type Wi-Fi password, add google account, install apps via google play, then removed with Titanium Backup the swiftkey app from system apps and reinstall it from google play
[Hovatek] Stock Backup (MTK) for Infinix X451.zip is not really a Stock Backup but a modded one,
It was helpful, but it would be better if someone could to out of the box Infinix X451 and made then upload the backup.
How can I restore the backup that I have done using MTK Droid tools? Because there is no system.img, just a system folder, how can I pack it (MTK Droid tools proposed to do so by I skipped it, as suggested in guide)
Here a guide to Create System.IMG from System Folder - Repack System.IMG (http://www.china-devices.com/topic/998-how-to-create-systemimg-from-system-folder-repack-systemimg/
) you need a Linux (or at least a virtual machine), it is time consuming, and maybe I will try it in the weekend.
Is it a good idea to compare the *.apk files from my backup to those in System.IMG in orther to add back apk I delted from backup?