Recovering a device that won't power on or is stuck in a boot loop.
The "dead-fix" flash files mentioned are typically used for technical repairs, such as:
All-plastic body measuring 142 x 71 x 8.3 mm and weighing approximately 160g, protected by Corning Gorilla Glass . Software & Maintenance Features
Supports 4G LTE , Dual SIM (Micro-SIM), Wi-Fi, and Bluetooth.
Manually updating or reinstalling the stock ROM using tools like SP Flash Tool for MediaTek chipsets.