I am a victim of gang stalking and have discovered that somebody has installed the PRET printer exploitation toolkit (github.com/RUB-NDS/PRET) on my HP Laserjet P2055dn printer.
I wish to re-install the firmware from the Hewlett Packard support website (support.hp.com/us-en/drivers/selfservice/hp-laserjet-p2055-printer-series/3662052).
The latest version of the HP Laserjet Firmware Update Utility only is for OS X 10.7 Lion, and there is nothing to download and use for later versions of OS X.
I am using El Capitan 10.11.
When I download and try to open the DMG file (ljp2055_Firmware_Update_Utility_20141201.dmg) I am unable to open the file, and get an error message saying 'The following disk images couldn't be opened: image not recognised'.
I have tried opening the DMG file with Disk Utility to no avail.
I do not have access to Microsoft Windows at all currently. I need to extract the necessary .RFU file, and then re-install the printer's firmware.
Does anyone have any ideas on how I can get this done?
Thanks in advance.