[Proposal] "Obtaining Firmware" section enhancement

[LucasVanHaaren]

I've recently been hacking with some SOHO routers and exploring hardware hacking techniques to obtain firmware. I noticed the current documentation could benefit from more details on firmware extraction methods.

I have successfully tested several workflows and can document them for the project :

• Direct SPI extraction (in-circuit/clip method using Hydrabus)
• U-Boot shell extraction via UART (Serial dump)
• U-Boot shell extraction via TFTP

Please let me know if this aligns with the project's goals, and I will start working on this.

[scriptingxss]

Agreed - these 3 proposed techniques would be great additions. Looking forward to your PR. thanks!