V8X Downgrade from M.ars to Original

Hi Everyone.

I know there is multiple threads discussing about the same thing but I have an issue that I couldnt find any solution for it. I upgraded my GTmedia v8x from base original to M.ars but I did not like it, and I want to go back to the original firmware.

I bought the cable USB to RS232 and downloaded "GTMedia_V7V8 Refresh Tool_V2.2" along with USB to RS232 driver.

I managed to connect my STB but it stuck on "usb start;fatload usb 0 83000000 flash.bin;sf burn 83000000 0 800000"

What I did

- Connect GTmedia v8x output RS232 to my PC (USB)

- Run Refresh Tool with Admin

- Downloaded latest base firmware from this site, renamed it to "flash.bin"

- format one of the USB2.0 4GB to FAT32 and copied "flash.bin" to it

- Connected my USB2.0 4GB to GTmedia v8x

- Refresh Tool will ask to reboot the v8x, and once I reboot it will start patching.

- it will reach to ~80% and stuck on "usb start;fatload usb 0 83000000 flash.bin;sf burn 83000000 0 800000" with no error or anything. (Image1)

- I notice when rebooting the GTmedia, it will not stop or stuck on boot to upgrade, but it will start the M.ars OS, not sure if thats the issue here and how to stop that

- I'm using Windows 10 Pro

- I tried latest available firmware & oldest available firmware

- I tried renaming the file from "flash.bin" to "update.bin" and same behavior

Thanks in Advance!

Quote from szprot5

load this software

Thanks szprot5. Unfortunately it behaves the same way, it did not work... What else can be done?

As I mentioned, when "Send_UPG" ask to "Please restart box" I do reboot the box but it loads the M.ars firmware which I think that prevent it from reading from the USB

Quote from szprot5

You can't load it from USB.

You need to load it with the GTMedia_V7V8 Refresh Tool.

With the flash.bin file renamed.

Same. See the attachment.

SOLVED!!! Here how:-

I bought CH341A Module and Connected it to the BIOS Chip in GTmedia v8x. The below steps I've taken

* I used BIOS USB Programmer Module CH341A, with its Driver

* I used "NeoProgrammer V2.2" available in Github

* I used "GTMedia_V8X_Release_v368_20250320" as my fallback flash

- 4 screw to be opened

- Identify the Chip location (normally its with 8pins)

- The small circle it means PIN1

- Connect board Pin with BIOS Pin [ I followed this Spanish guide on YT 3:50 YTcom/watch?v=m3py4hI9DcQ ]

- Connect the red line to Pin1

- Open NeoProgrammer and click on "Detect" > Choose the Chip

- Read the Chip

- Take backup of your Chip by Saving it

- Erase the Cip

- Upload the base firmware - I used "GTMedia_V8X_Release_v368_20250320"

- Apply/Write the base fw to your Chip

- Verify (no errors or warnings) -- If you got errors, ensure you Erase first.

- DONE!!