You rarely see those kinds of unlocks anymore unfortunately, since they started using eFuses to disable parts of the chip permanently. It still happens occasionally though, like the time when AMD decided to add a 4GB SKU alongside the originally planned 8GB SKU of one of their graphics cards so late in development that they didn't have time to actually change the hardware, so all of the initial batches had 8GB installed with half of it disabled in the VBIOS where applicable, which was easy to reverse by flashing the VBIOS from the 8GB version.
The one time in history when "download more RAM" wasn't just a meme.
The one time in history when "download more RAM" wasn't just a meme.