ERROR CODES: 0X83C0002B NOS_LOADER_APP

[NormaLou]

hp 4520 ALL IN ONE SHOWING ERROR CODES;  0X83C0002B  NOS_LOADER_APP. Printer will not print or connect to Internet.

[VikramTheGreat]

Hi @NormaLou,

Welcome to the HP Support Community.
 

Thank you for reaching out. I understand your HP printer is showing the error code 0x83C0002B NOS_LOADER_APP, and you are unable to print or connect the printer to the Internet.
 

To provide the correct troubleshooting steps, could you please confirm the exact printer model?

• Is this an HP ENVY 4520 All-in-One Printer?
• Or is it another HP 4520 series printer (for example, a DesignJet or another product line)?

The troubleshooting steps can vary depending on the printer family, so we want to make sure we provide the correct guidance.
 

If this is the HP ENVY 4520 All-in-One Printer, please try the following basic steps:

1. Turn the printer on.
2. Disconnect the power cord from the printer while it is powered on.
3. Disconnect the other end of the power cord from the wall outlet.
4. Wait at least 60 seconds.
5. Connect the power cord directly to a wall outlet (avoid power strips if possible).
6. Reconnect the power cord to the printer and turn it on.
7. Check if the error message clears.

If the error remains:

• Please let us know exactly what appears on the printer screen.
• Confirm whether the printer can reach the Home screen or remains stuck on the error.
• Let us know if the error appeared after a firmware update or any recent change.
   

Also, please share:

• The exact printer model name shown on the printer label.
• Whether you are using the HP app or another method to set up the printer.
• Your computer/mobile device operating system.

Once we have the exact model and additional details, we can review the available HP-supported options and guide you further.