Showing "Ready 2 Download" message and printer is shown offline to computer.

[SanaMalik]

Showing "Ready 2 Download" message and printer is shown offline to computer.  It is not performing photocopy and is not performing initialization.

[Repairatrooper]

to fix this issue you need to re-update the firmware. If you get the acknowledgement beep when you plug the usb cable into your computer there is hope.

1- on your PC, go to control panel>devices and printer and add a new printer. When Windows starts to search, click the "printer not found" option at the bottom and then select the option for manually install local printer

2- Chose existing port option on next screen and pick the first USB port you see on the dropdown list. You may have many listed.

3- When prompted for driver select any HP lasejet jet, it does not matter. When promoted for name call it "usb fix"

4- Download and run the current easy firmware update program for your printer and when prompted for printer, select the "usb fix" printer you just created.

5- If you lucked out and selected the correct USB port the firmware will start to upgrade. If not, nothing will happen. After waiting a couple of minutes, if it does not start, on your PC go to control panel>devices and printers and right click on the icon for "usb fix" and select printer properties from the middle of the dropdown menu. Click on the ports tab and select the next USB port on the list and click "apply". Wait a couple of minutes. Repeat this until the printer starts to receive the firmware. 

6- Firmware install will complete unit will restart and should work. You may need to reinstall your printer to be able to print but the error will be gone.

[Abdullmayar]

sending firmware the printer will be on or Off ?
is the give way is the write way of updating firmware 
Firmware Corrupt Ready 2 Download on the MFP HP LaserJet M2727 nf

Firmware Corrupt Ready 2 Download on the unit HP LaserJet M2727 nf
This unit came to us after a while the firmware hangs and the customer had to turn it off, then boot appeared the inscription «firmware Corrupt Ready 2 Download 'and a computer was to determine this MFP as an" unknown device "(on windows 7 when connecting the MFP is identified system as the HP LaserJet M3020).

Lockups during operation of these devices gives the processor is treated by this "disease" with the help of warm-up.

In order to have in HP LaserJet M2727 nf firmware we have nothing stuck, we warm up the processor.
Next to fill in the MFP firmware via a USB cable, we need to do the following steps:
Turn it off with the button on the left side at the bottom, thus leaving the USB cable connected to your computer.
Download the universal driver on our >>> <<< link to extract the contents to a separate folder and click on Instal.e

Port select USB001-USB004 - Virtual Printer Ports for USB (in our case was can only USB001 - which is very good), if you had installed more than one printer, you will need to choose at random, it takes a little more time.
when a driver set, you will have our printer in the "Devices and Printers" at the same time an unknown device and will be determined, but a way for USB firmware will indicate on him

4. Now download the program for updates on our >>> link <<<

Click on the downloaded file, select our printer previously installed click on the Send Firmware, ( If you click the Send Firmware button in your bottom right corner says "Unable to print ...", then you need to select a different port, one-USB004 USB001 )

smiley wait until you come and turn the printer

The display will show these signs: Printing Document, Erasing, Programming, and the printer should reboot itself.
Supplement material:
Forced boot mode: when you turn on the "OK" and "Stop" button (red X)

If you had previously installed the printer, follow these steps before proceeding to the above actions:
1.Nazhimaem Win + R and writing net stop spooler to click OK
2.Perehodim in C: \ WINDOWS \ SYSTEM32 \ SPOOL \ PRINTERS and delete everything that is there
3. Again, press Win + R and writing net start spooler, and click OK
4 . Remove the printer driver

[SanaMalik]

Thank you for your response. We have tried these steps the display on the printer shows:

Downloading 

Erasing

Fatal Error 7

[east2100]

Just try to re-send firmware again if that's not work then you need to replace the formatter.