By that definition of "disable", HP is disabling their customers' printers regardless of whether they use ink cartridges from another manufacturer. It's clear t

By that definition of "disable", HP is disabling their customers' printers regardless of whether they use ink cartridges from another manufacturer. It's clear that that is not the intended sense, however, because the headline says "if they use...". If that meaning was intended, the headline should read "HP disables the use of third-party ink cartridges on their customers' printers with a firmware update", or something like that. I agree with OP that as written the headline is misleading.