Firstly before I go into much details here are the requirements for the flash work you will be doing in the device
Also take note that these will erase everything and any data whatsoever on the device
1 a computer or laptop
2 the device
3 a connected wifi
4 a working cord
Okay if you have all these things in order we can begin the flashing process step by step
Okay first of all download the stock rom of the device you want to flash for example if you're flashing an infinite x551 you will have to download an x551 stock rom
After downloading that you will also need to download drivers for your pc and download simple flash tool in other to flash your device also turn off your device while doing it
Once the download is completed install the drivers and launch the flash tool
After doing this open scatter loading from the flash tool on doing the a series of list will pop out
Then click on the download button then it while start flashing
Then once it brings out the download ok button your device has successfully flashed and it's as good as new
Thank you