Flash an Anet ET4x to Marlin 2+ firmware using ST-Link v2 in Minutes!
103Open source Marlin firmware allows us options with our printer. Anet has heard, and using a ST-Link V2, it is pretty easy. These steps are for the ET4x. As always, when flashing firmware make sure you have the correct model for your printer. Anet has files you can download here.
https://anet3d.com/blogs/download
An awesome user Karl created a blog that showed how to recover or fix the ET4. I snagged a ST-Link and decided to give it a try and show you how it works.
Link to Karl's Blog https://www.cnx-software.com/2020/02/04/how-to-recover-from-a-bad-firmware-upgrade-on-anet-et4-3d-printer/
There was also a desire for the firmware to be open sourced. Today, I can say it is here. Marlin 2.0+ has been released and is available for you to customize to your heart's content. This is a link to the open source firmware https://github.com/anet-3d/Marlin/tree/Anet-Marlin-bugfix-2.1.0
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