1. Download the recovery image in .img format for your device and place it in a hotel folder on your computer. Be sure to rename the image to recovery.img and nothing else. Download the scatter file (a file in .txt format, usually located in the folder with the firmware for the device) and place it in the same folder where you placed recovery.img, to make it as shown in the screenshot below:
[attachment = "7888980: svsmvee4yuvhyzqxgc.png"]

The folder name should not contain Cyrillic characters, only Latin letters and numbers. Make sure that there are no other files in this folder. Usually, recovery.img and the scatter file are already in one archive for easy installation, but if you only have recovery.img, then the scatter file can be taken in the archive with the firmware for your device.

2. Unpack the archive with the Flash Tool and run the file Flash_Tool.exe from there, as an administrator (right click on the file ->run as administrator). If a warning appears stating that the Scatter file is not loaded, then simply click OK to continue.

3. Before you open the program, click on the Scatter-loading button in the right corner of the program window. A review window will open, go to the folder where recovery.img is located and select a scatter file (for example, MT6592_Android_scatter.txt)

4. Before continuing, make sure the device is disconnected from the PC. After selecting the scatter file, the recovery tool should load in the Flash Tool window, make sure that the check box is just opposite the RECOVERY section and nowhere else (sometimes the boot.img file is also flashed along with the recovery, in which case it will be provided along with the recovery and will be in the same folder called boot.img)

5. Next, to transfer the program to the smartphone connection standby mode, click the Download button in the program window (if a warning pops up indicating that not all files are downloaded, click OK to continue). It should turn out as shown in the screenshot below (for the 5th version of the Flash Tool and for the 3rd version of the Flash Tool)

[attachment = "7888992: Screenshot_2.png"]
[attachment = "7888994: Screenshot_3.png"]

6. After you clicked the Download button, take your device in your hands and turn it off completely. If your device has a removable battery, then “twist” it (pull out / insert), but after that do not turn on the device, but leave it off. Now just connect the switched off device to the computer in order for the Flash Tool to start the firmware of your recovery. Since we are only flashing the recovery partition, the firmware should take a few seconds. After the end of the firmware, a window will appear with a green circle (if the firmware does not start, in 99% of cases, this is a problem with the drivers, that is, they are not installed stupidly)

7. As soon as the firmware is completed, disconnect the device from the PC, but do not rush to turn it on. If the battery is removable, then "twist" it again, but, again, do not turn on the device.