Works fine last time.
However, this time it worked for a few weeks, but then once the message "Invalid Toner" came up and I could no longer print.
SOLUTION: I taped over the 4 metal contacts at the back of the toner, and it works! (Just with the message "Toner low").
EXPLANATION: the built-in chip is simply ignored as it is no longer accessible, and the toner works even without a chip (until now...).

Question

Works fine last time.
However, this time it worked for a few weeks, but then once the message "Invalid Toner" came up and I could no longer print.
SOLUTION: I taped over the 4 metal contacts at the back of the toner, and it works! (Just with the message "Toner low"). 
EXPLANATION: the built-in chip is simply ignored as it is no longer accessible, and the toner works even without a chip (until now...).

Accepted Answer

Thanks for the tip!

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