HP Original Cartridges
(The "X" size won't fit the M601)
Reliable Remanufactured Cartridges
Error Message Accept bad signature for HP LaserJet M601, M602, M603 Series Printers.
HP Say:
Accept bad signature
Description
The product is performing a remote firmware upgrade, and the code signature is invalid.
Recommended action
Download the correct firmware upgrade file for this product, and then reinstall the upgrade. See the product user guide for more information.
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