boot.img
kernels, ramdisk are found in this file. It also contains all the files needed for the device to boot. flashing a wrong boot.img will make the device not to boot.
cache.img
Like its name, it stores data that are frequently used in the device. Not really useful when flashing a device. You can leave it unticked.
Checsum.ini
This file simply verifies md5 checksum. Most times this results to an error displayed on the screen while trying to load a scatter file. If you have the checksum error, delete checksum.ini and reload your scatter file.
EBR1 and EBR2
This are partitions found on your device.
uboot.bin
Universal Boot Loader. Flash this when device is not booting
Logo.bin
This contains all the files for the logo found in the device. If you will like to create your own custom logo.bin for your device, click here
MBR
Master Boot Recorder. This actually describes the partitions found on the device.
Scatter File
This describe the regions where each of the images and files found in the ROM will be flashed to the device.
Preloader.bin
The preloader is the file which makes the phone to communicate with the PC. Most times its dangeous flashing preloader to your devices. Flashing a wrong preloader can hard brick your device. Tick this if you are sure its the preloader of your device and the device you are about to flash is completely dead.
Recovery.img
This is the recovery of your device. You can replace this with custom recovery like CWM or Philz which are made for the device.
If you want to learn how to make a CWM recovery, click here
For Philz recovery, Click here
Secro.img
Contains the baseband and imei of the device. Sometimes flashing this can result to null or invalid imei. To restore your imei, click here
System.img
This contains the entire Android operating system found on your phone. Most times (especially when phones hangs on boot logo) this is the only file that is needed to be flashed. In sp flashed tool, it is listed as android.
UserData.img
This contains personal data like applications, messages, contacts etc found on the device which the ROM was made from. Its not necessary to flash this image except you want to regain back all the files.
Thats all about the files found inside ROM of a MediaTek (MTK) device. Hope you learnt a thing or two.
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