Flashing firmware

Easy way - NiimBlue

Open niim.blue, connect your printer and use printer menu to flash the firmware¹.

Hard way - jcPrinterSdk

jcPrinterSdk comes with NIIMBOT 3.x for Windows (and for other OS maybe). jcprinter is a local websocket server that the NIIMBOT application uses to communicate with the printer. To run server in foreground, other instances must be closed.

To flash firmware with jcprinter, the following Python script² can be used:

import websocket
import json
from zlib import crc32

websocket_url = "ws://localhost:37989"
filename = "/absolute/path/to/firmware.bin"
version = "3.01"

ws = websocket.WebSocket()
ws.connect(websocket_url)

# receiving info about connected printers
req = {"apiName": "getAllPrinters"}
ws.send(json.dumps(req))
connectData = {}
message = json.loads(ws.recv())
if message.get("resultAck", None) and message["resultAck"].get("info", None):
    info = json.loads(message["resultAck"]["info"])
    connectData["printerName"] = [*info][0]
    connectData["port"] = int(info[connectData["printerName"]])

# connect Printer
req = {"apiName": "selectPrinter", "parameter": connectData}
ws.send(json.dumps(req))
message = ws.recv()
print(json.loads(message))

# enable detailed logging to console
req = {"apiName": "enableConsoleAllLog", "parameter": {"isEnable": 1}}
ws.send(json.dumps(req))
while True:
    message = json.loads(ws.recv())
    if message.get("apiName", None) == req["apiName"]:
        break
print(message)

with open(filename, "rb") as f:
    fw = f.read()
    crc = crc32(fw)

print(f"Firmware CRC: {crc:08X}")

req = {
    "apiName": "updateFirmware",
    "parameter": {
        "fileName": filename,
        "strSwVersion": version,
        "strCrc": f"{crc:08X}",
    },
}

ws.send(json.dumps(req))

while True:
    message = json.loads(ws.recv())
    if message.get("apiName", None) == req["apiName"]:
        print(message)
        resAck = message.get("resultAck", None)
        if resAck and resAck.get("result", None) == 0:
            break

# close the websocket connection
ws.close()