Created How to use keyboard UART port to flash firmware (markdown)

How-to-use-keyboard-UART-port-to-flash-firmware.md

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+On uConsole keyboard back,there is a **UART** port which can be used with `stm32flash` to flash keyboard firmware  
+
+Especially at when your keyboard met problem  
+
+here is the process:  
+
+* put the switch 1 ON
+* connect uart with a fpc 6p connector to a serial-usb converter
+* use stm32flash to flash bin file
+
+## Whole connection view
+![uconsole_kbd_stm32flash](https://github.com/user-attachments/assets/66a0028a-b6c1-4af2-92e7-91c6179fe272)
+
+## UART ports 
+![sch](https://github.com/user-attachments/assets/06d88726-af96-4573-ba60-74b870bb07cf)
+
+3 is TX(PA9)   
+4 is RX(PA10)  
+
+
+## 1st pin of UART on board
+![7130803](https://github.com/user-attachments/assets/eeed0c0a-ea86-4496-b931-dcc074835eca)
+
+## Flashing command
+
+```
+$ sudo stm32flash -w uconsole.kbd.0.4_48mhz.bin -v -S 0x08000000 /dev/ttyUSB0
+```
+## Normal flashing output
+```
+stm32flash 0.5
+
+http://stm32flash.sourceforge.net/
+
+Using Parser : Raw BINARY
+Interface serial_posix: 57600 8E1
+Version      : 0x22
+Option 1     : 0x00
+Option 2     : 0x00
+Device ID    : 0x0410 (STM32F10xxx Medium-density)
+- RAM        : Up to 20KiB  (512b reserved by bootloader)
+- Flash      : Up to 128KiB (size first sector: 4x1024)
+- Option RAM : 16b
+- System RAM : 2KiB
+Write to memory
+Erasing memory
+Wrote and verified address 0x08010000 (100.00%) Done.
+```
+