Serial # on HP DeskJet 2800e All in One not recognized

[Kensington8]

The HP Smart App consistently fails in connecting to my printer wirelessly. I cannot troubleshoot or submit a ticket b/c the SN I'm plugging in (on the bottom of the printer) is not recognized. I'm wondering if I have a fake printer. Bought on Amazon but I'll I want to do is get a refund for it. It's the worst. I'm beyond the Amazon return window but have had this product for less than 6 mos. and it's impossible to connect, and honestly worthless. I have a LaserJet and has worked perfectly for years, but working with this all in one is a nightmare. Pls help.

[VikramTheGreat]

Hi @Kensington8,

Welcome to the HP Support Community.
 

Thank you for posting your query. I will be glad to help you.

I can feel your frustration through your words. When a printer refuses to connect, the HP Smart app loops endlessly, and the serial number isn’t recognized, it can feel like you’re fighting a machine that simply doesn’t want to exist.

First: Don’t worry: HP DeskJet 2800e fakes are extremely rare.

Even units bought on Amazon (including 3rd‑party sellers) are almost never counterfeit.
But unrecognized serial number usually points to:

1️⃣ A mis-typed serial number (very common)

The underside label is tiny, and many people mix it up:

• 0 ↔ O
• 1 ↔ I
• 5 ↔ S
• 8 ↔ B

2️⃣ The printer is from another region

If the seller imported it, the serial might not validate on the U.S./India HP support page.
This does not mean it’s fake.

3️⃣ The printer is not yet added to HP’s entitlement database

This sometimes happens with newer or region-transferred models.

💛 Good news: You can still get support even if the serial number doesn’t validate online. HP has alternate verification routes.

Let’s fix the connection issue first, step-by-step, the HP way

STEP 1: Reset the printer’s Wi-Fi (VERY IMPORTANT)

This clears old configs that often block HP Smart detection.

Do this:

1. Press & hold the Wi-Fi button + Cancel button together for 5 seconds
   You’ll hear a soft chirp and see the Wi-Fi light start pulsing.

This restores the printer to Wi‑Fi Setup Mode.

STEP 2: Add the printer through HP Smart again

1. Open HP Smart
2. Tap Add Printer
3. Look for the HP DeskJet 28xx series
4. Select your Wi-Fi network
5. Enter the Wi-Fi password (case‑sensitive)

Important:
📌 The printer supports 2.4 GHz only, not 5 GHz.
If your router combines both, the connection may fail.

STEP 3: Reset HP Smart (your phone/computer)

Sometimes the app is the problem, not the printer.

On Mobile:

• Uninstall HP Smart
• Restart device
• Reinstall HP App

On Windows/Mac:

• Sign out → Quit → Relaunch
• Clear devices
• Re-add printer

I hope this helps.

Take care and have an amazing day!
 

Did we resolve the issue? If yes, please consider marking this post as "Accepted Solution" and click "Yes" to give us a helpful vote - your feedback keeps us going!

Regards,

VikramTheGreat

[VikramTheGreat]

Hi @Kensington8,
 

I hope this helps.

Take care and have an amazing day!
 

Did we resolve the issue? If yes, please consider marking this post as "Accepted Solution" and click "Yes" to give us a helpful vote - your feedback keeps us going!

Regards,

VikramTheGreat