Lenovo Legion Slim 5 16APH8 (RTX 4070) - Turns on for a few seconds then shuts off. BIOS issue.

[riko 656]

Hello everyone,
I need help with my Lenovo Legion laptop. It turns on for a few seconds and then immediately shuts down. I believe this is a BIOS corruption issue.
Laptop Model:

• Model: Lenovo Legion Slim 5 16APH8
• GPU: NVIDIA GeForce RTX 4070
• Main BIOS chip size: 32MB
• VBIOS chip size: 16MB

Problem Description: The laptop was working perfectly. Now, when I press the power button, the keyboard lights up and the laptop powers on for just a few seconds, then it shuts itself off completely. After researching, I am convinced it's a corrupt BIOS.
What I Have Tried So Far:

1. I bought an external programmer (CH341A) to re-flash the BIOS.
2. I downloaded the official BIOS update from the Lenovo website.
3. I accidentally deleted the original backup I made from the chip before I could properly flash it.
4. I am now unsure which file to use and how to handle the separate 16MB vBIOS chip.

My Question: Could someone please provide a reliable BIOS dump file for this specific model? I am looking for both the 32MB main BIOS file and, if possible, the 16MB vBIOS file. Any advice on the correct procedure to flash them would be greatly appreciated.
Thank you