From this post you get good factory signed firmware official stock ROM from the source with flash tool, USB driver and how to flash it
D.LIGHT M100 FACTORY SIGNED FLASH FILE OFFICIAL STOCK ROM
this flash file helps you to fix your phone back to its original stock ROM also fixed dead,
hang logo, FRP reset, password, IMEI problem, with software problematic
Name file: MT6570_EMMC_MRA58K__6_0_ A50 a90 _welcome_2019_11_27_13_37
Size file: 659.0MB
Flash tool: Sp flash tool
Download agent (Da file): M200 DA FILE
USB driver: ALL IN ONE MTK
File status: Paid
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HOW TO FLASH THIS STOCK ROM
1 Download and unzip/extract firmware (flash file) on you computer
2 After extract/unzip firmware you will needed to be with flash tool and USB mtk driver
2 install USB driver on your pc if driver you already installed you can leave this step
3 After installation driver now open sp flash tool load scatter.txt from firmware folder
4 Then load or put download agent or DA file from da file folder
NOTE: if you are going to install or flashing this firmware(flash file) take a backup before because it's going to delete or remove all data
