HP LaserJet Pro MFP M28a full factory reset

[gabor1102]

Hello,

My printer is an HP LaserJet Pro MFP M28a without wi-fi. There are only buttons CANCEL, COPY and ON/OFF.
After a successful firmware update, I see only rbx-load.
When I switching on the printer I have always the LEDs "Ready" and "Attention" lights ON.
Please send me the reset instructions for the HP LaserJet Pro MFP M28a printer?
Thank you for helping.

[A_Gayathri]

Hi @gabor1102,

Welcome to the HP Support Community

I understand you are facing an issue with your HP Printer. Not to worry I will help you to get a resolution to resolve the issue.

We have to perform a Semi Full Reset to unlock the features of the printer/Reset the password. 

The reset instructions are specific for your printer and performing those steps on a different printer may brick the device. 

I've sent you a private message with reset instructions, follow the reset instruction to perform a full reset and re-initialize the printer. 

In order to access your private messages, click the private message icon on the upper right corner of your HP Community profile, next to your profile Name or simply click on this link.

Hope this helps! Keep me posted. -

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[gabor1102]

Hi @Gaya1239,

Thank you for your answer.

Unfortunately, I did not receive a message, the inbox is empty.

[A_Gayathri]

Hi @gabor1102,

Welcome to the HP Support Community

I understand you are facing an issue with your HP Printer. Not to worry I will help you to get a resolution to resolve the issue.

We have to perform a Semi Full Reset to unlock the features of the printer/Reset the password. 

The reset instructions are specific to your printer and performing those steps on a different printer may brick the device. 

I've sent you a private message with reset instructions, follow the reset instruction to perform a full reset and re-initialize the printer. 

In order to access your private messages, click the private message icon on the upper right corner of your HP Community profile, next to your profile Name, or simply click on this link.

Hope this helps! Keep me posted. -

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[gabor1102]

My solution:
Reprogramming the MX25L12835F Flash Memory IC and 4128BWP EEPROM IC on the formatter board. Writing the .bin files (https://file.remont-aud.net/comment/files/05-03-22-13-04-26_m28.rar) to the two ICs using the CH341A USB programmer + AsProgrammer software. (Or replacing the formatter board, but that is more expensive.)
After reprogramming the ICs, the printer no longer indicated an error (Attention LED does not light), only the ON LED blinks continuously and the PC identified the printer as an HP LaserJet 3020.
I installed the printer with Generic /Text Only driver and then installed the factory firmware update (version 20210121) downloaded from the HP site.
After that, the PC correctly identified the printer (HP LaserJet MFP M28-M31), printing and scanning work perfectly.