@gehlen whatever, it's your call, I was one of the very few people who actually knows what you were asking for and also might be able to help you, but since you are such a smart a*s, I won't spend my time on you with this attitude!
Do what JaredDM said…
Even if it is true, I do not care about me. There are people who know there are important things in this world more than selfish.(see JaredDM)
Dont make a shadow over me
I Wouldnt want anything else… Diogenes
Good bye
Have you tried the Huawei HiSuite backup method?
no, cause HiSuite is back up only contacts, messages, apps, pictures, videos, songs, call logs, emails, and agendas, to a computer. (Or do I know wrong? )
but I need system files, deleted conversations, chat records, etc
MOBILedit Forensic Express has an Huawei rooting capability leveraging HiSuite.
I have not tested this feature.
@gehlen HiSuite can backup apps data as well, if the phone is unlocked and you can enable HDB, which is not your case, since your device is locked.
Unfortunately there isn't any working recovery image for bootloader bypass either, which can mount the userdata partition decrypted. I would be happy to be wrong!
@UnallocatedClusters the post is about a Huawei P Smart FIG-LX1 device, what do you mean by "HTC rooting capability leveraging HiSuite" ?!
Mobiledit Forensic Express have Huawei tool to acquire backup. 
As I stated earlier, this solution exists only for open phones, where you are able to enable HDB.