Changing firmware in the phone will erase all of your data.
All described operations you are doing at your own risk.
If want saves your data do a backup before start.
Always is good have it before any play with the phone like firmware change, root, frp reset because in full backup you got everything for repair damaged phone(nv zone, imei zone, simlock zone, bootloader, preloader etc.) even if you full erase it.
To write this backup to phone if something goes wrong we will write manual in future, for now need to go to the professional service centre with it and they will fix the phone for you.
By Wojtek Góralczyk on Nov 16, 2017
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