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~~Brother accused of locking down third-party printer ink cartridges via forced firmware updates, removing older firmware versions from support portals~~ [see comments]
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i came across this explanation of it, haven't verified it directly but he seems to make good content:
https://youtube.com/shorts/ZX8OaZZDlM8
he says theres identification each time you print using the yellow ink, and basically is a counterfeit currency countermeasure
id kill to have a foss print setup though