This is the official page, from which you can download the Official FPT Buk S2 Stock Firmware ROM (flash file) on your Computer. The Firmware Package comes as a zip file which contains the Firmware, Flash Tool, Driver and How-to Flash Guide.
Download FPT Buk S2 Stock ROM (flash file)
Package Name: FPT_Buk_S2_SP6531_MIRA.zip
Package Size: 3 MB
How-to Flash: Use Miracle Box Software to Flash this firmware on your Device.
How to Flash FPT Buk S2 Stock ROM
Step 1: Download and Extract the FPT Buk S2 Stock Firmware on your Computer.
Step 2: Once, you have extracted the Package, you will get the update.zip firmware and How-to Flash Guide.
Step 3: Now, Copy the update.zip firmware on your device SD memory.
Step 4: Once you have copied the update.zip firmware, Power Off your device.
Step 5: Now, boot into the recovery mode by pressing Volume UP + Power Button.
Step 6: Once, you have booted into the recovery mode, select the update.zip firmware to flash it.
Step 7: Once flashing is completed, restart your device.
[*] Original firmware: We only Serve the original firmware which is released by the company and we scan each of our firmware with Eset Internet Security before uploading it online.
[*] Backup: We recommend you to take a backup of your personal data before flashing the Stock Firmware, as flashing the firmware delete the personal data from the device.
[*] Caution: We do NOT recommend you to Flash the Preloader.bin. As it may brick the device, therefore we recommend you to Untick the Preloader which Flashing in on your device.