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Signed-off-by: Sgr A* VMT <1611902585@qq.com>

English Documents/Can rate switching And Firmware update.md

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+## CAN Frequency Switching
+
+First, connect to the host computer.
+
+Recompile the firmware for the CAN communication device (U2C or Can Bridge) directly connected to the host computer and set the frequency to 1M to communicate with IDM.
+
+Use the following command to query IDM's UUID:
+```bash
+~/klippy-env/bin/python ~/klipper/lib/canboot/flash_can.py -q
+```
+
+Download the required frequency IDM firmware and canboot overlay firmware from the cloud drive.
+
+Execute the following command:
+```bash
+~/klippy-env/bin/python ~/klipper/lib/canboot/flash_can.py -f <path to canboot update firmware> -u <UUID obtained>
+```
+For example, `<path to canboot update firmware>` could be ~/Canboot 1M.bin. Fill in your data and remember to remove the `< >` brackets.
+
+Wait for the execution to complete, then enter:
+```bash
+~/klippy-env/bin/python ~/klipper/lib/canboot/flash_can.py -f <path to new frequency IDM firmware> -u <UUID obtained>
+```
+For example, `<path to new frequency IDM firmware>` could be ~/IDM_CAN_8kib_offset_1M.bin. Fill in your data and remember to remove the `< >` brackets.
+
+If you want to switch to USB communication, you can flash firmware with the USB label using the same method and solder the mode-setting jumper on the back of IDM to the side with USB.
+
+## If you are currently using USB firmware and want to update or switch to CAN mode:
+
+```bash
+cd ~/klipper/scripts 
+~/klippy-env/bin/python -c 'import flash_usb as u; u.enter_bootloader("<your device serial port address>")'
+cd ~
+~/klippy-env/bin/python ~/klipper/lib/canboot/flash_can.py -f <firmware path> -d <your device serial port address>
+```
+
+The device serial port address refers to the address in the format /dev/serial/by-id/****. Please note that the serial port number for the second time should be different. Re-query it.
+
+Fill in your data and remember to remove the `< >` brackets.