You can download Firmware / stock rom via Mediafire Server which is not in limit and not in password. All the tutorials are free and I have tested myself all the problems like bootloop, softbrick, hardbrick, stuck logo / hang, successfully run smoothly and normal again.
How to Flash Firmware
Step 1: you should download the firmware and prepare tools such as computers – usb cable – and internet network.
Step 2: After extracting the firmware, you will find the SP Flash Tool, Driver and the instruction manual.
Step 3: Installing drivers is easier to do if you connect to the internet and connect the smartphone directly in download mode. if not please please install the driver manual in the zip file that you extracted earlier.
Step 4: Open the SP Flash Tool and load the Scatter File from the firmware folder.
Step 5: Connect your Smartphone to the computer using the USB Driver.
Step 6: Click on Upgrade / Download Button in the SP Flash Tool to Begin the Flashing.
Step 7: Green Ring will appear at the end of successful Flash.