[Mikesew]

I want to flash custom ROM to phone and I don't know how to take full backup of my device to recover If something goes wrong. To prevent invalid nvram and nvdata.

Camon CX Air
Android-7.0
MT6737


Can I use TWRP For this?

Sent from my TECNO CX Air using Tapatalk

[EMMANUS]

You can try NCK mtk tool or use WWR ; the guide https://forum.hovatek.com/thread-21970.html

Miracle c***k will not work

[innagee]

I want to flash custom ROM to phone and I don't know how to take full backup of my device to recover If something goes wrong. To prevent invalid nvram and nvdata.

Camon CX Air
Android-7.0
MT6737


Can I use TWRP For this?

Sent from my TECNO CX Air using Tapatalk

yes, you can use twrp to backup but know the backup can only be restored via TWRP, in a case where the phone is totally dead then the twrp backup will be useless. 
So, its best you backup using Miracle Box or WWR_Mtk tool, see links @Emmanu's reply.