Flashing firmwares
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Get new .bin firmware. Original firmware files you can find here: https://dev.mmote.ru/niimbot-fw/
Use firmware only for your printer model. Also do not use different major firmware version (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 "gear" menu, enter new firmware version (it should me math the version of bin file).
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Press "Upgrade FW" and choose firmware file.
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Wait for flashing is finished. Please keep NiimBlue tab on the foreground.
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After flashing, device will be unresponsible for the couple of seconds.