Flashing firmwares
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Obtain new .bin firmware. Original firmware files can be found here: https://dev.mmote.ru/niimbot-fw/
Use only the firmware for your printer model. Also, do not use different major firmware versions (for example, if you have 5.14, do not flash 6.x).
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Connect your printer. Prefer USB connection (firmware process will be faster).
Open the printer's "Gear" menu, enter the new firmware version (it should match the version of the bin file).
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Press "Upgrade FW" and select the firmware file.
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Wait for flashing to finish. Please keep the NiimBlue tab in the foreground.
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After flashing, the device will be unresponsive for a few seconds.