Honor 9 lite slows down after hard reset, how to fix it?

Question

Mobile devices

Model LLD-AL10 Build
number 9.1.0.125(C675E5R1P4)
EMUI version 9.1.0
Android 9 version
Processor Hisilicon Kirin 659
RAM 3 GB
Kernel version 4.9.148
Phone memory free 21.5 GB out of 32 GB

Began to slow down terribly, nothing happened reacts, sometimes the screen does not have time to appear after unlocking, as it immediately goes out, there were no applications except for the viber.
It was decided to make a hard reset, but the phone still slows down a lot, a "clean" phone with factory settings thinks for about a minute over each action at best, and it takes 20 seconds for the printed letter to be displayed. In safe mode, the phone works well, but I need a normal mode.
How can I fix the problem? in operation 1 month, no warranty (since from China).

Answer 1

How can I fix the problem? in operation 1 month, no warranty (since from China).

Firmware global or china?
If china - then they had a lot of software in stock, which actively used gps, telemetry, and constantly launched something in memory.
Maybe a rebuild or downgrade will help.