Hi. Im glad to be the one who will be assisting you with the instructions on how to flash your AG zoom smartphone. Since I don't know whether you have any android flashing experience, I'll be giving the instructions to you as if I'm giving instructions to a beginner. This model of ag zoom is a MTK device.
You will need a computer, there is no any other way you can flash any smartphone without a computer. You will need a USB cable, this is what you are going to use to connect the mobicel trendy to your computer when flashing. You also need to have the AG zoom next to you. Make sure the AG zoom is completely off and never switch it on until you have finished flashing.
From your computer you will need to download the following files. Download the AG zoom firmware here. The firmware is the complete operating system of your AG zoom. Next download the sp flash tool here, this is the tool that you are going to use to flash the firmware into the mobicel trendy smartphone. Lastly, download the vcom driver here to your computer, the vcom drivers are going to help your computer detect your phone when you connect it to the computer using the USB cable. Extract all the downloaded files out of the zip file.
First you need to install the vcom drivers, follow the instructions given here on how to install the vcom drivers. Open the sp flash tool extracted folder and double click the file named "flash_tool" to run the sp flash tool. Click the "scatter_loading" on the sp flash tool and navigate to the extracted firmware folder and select the scatter file then click "open". Wait for the scatter file to load, it might take 3 seconds to load. From the check box list uncheck "preloaded".
Now click download and connect your phone to your computer with the USB cable. You can connect the phone to any of the USB ports on your computer. If the sp flash tool is flashing it will show a red line followed by a yellow line and when it has finished it will pop up a green tic. After the green tick, remove your phone and switch it on. Done flashing a AG zoom.