LONGER LK4 X - 5. FAQ manual; 5.1. How to update the firmware?

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5. FAQ manual
5.1. How to update the firmware?
First confirm whether the printer has a auto level sensor, the firmware
with auto level sensor is different from that without sensor. Please
download the according “firmware.bin” file from the link bellowed, and
copy it to the root directory of SD card. Insert the SD card to the printer,
restart the printer and wait for update. It is recommended to delete the
“firmware.bin” file from the SD card after the update is completed,
otherwise it will be updated again when the printer is restarted next
time.
https://www.longer3d.com/blogs/news/printer-download-guildelines
5.2. How to solve a clogged nozzle?
1) First, preheat the nozzle to a high temperature, such as 200
℃
for PLA,
then push the Teflon tube until it can no longer be moved forward to
ensure it is contacted with the nozzle;
2) Then move up the Z axis and use the 0.4mm needle to insert it from
below the nozzle when the nozzle is heated up to a right temperature,
and rotate the needle while inserting to clean the dirt in the nozzle again
and again;