WF-7710 Shows Up as PX-M5081F After Mainboard Replacement: Recovery Firmware, Inspection Mode, and EEPROM Reprogramming

Question

I replaced the main board (CG36, 2188175) in my Epson WF-7710, along with the ribbon cable and the printhead. When I powered it on, it went into Recovery Mode, so I installed Epson's Recovery Mode firmware (FA21N7) from Epson's website. After the printer restarted, it showed the "Inspection Mode" menu. I selected "Normal Mode," but now my computer detects the printer as a PX-M5081F instead of a WF-7710.

Does another PROM need to be programmed? Can you do this service, and if so, what would it cost?

Answer

With that said-yes, what you're seeing strongly points to an EEPROM (PROM) data issue, and it's a known outcome after board swaps plus recovery/inspection firmware paths.

Why a WF-7710 Can Identify as PX-M5081F

When your PC identifies the printer as PX-M5081F, it doesn't mean the hardware magically became that model-it usually means the printer's identity data (model code/region configuration) stored in non-volatile memory does not match a WF-7710 profile.

On Epson platforms like this, critical "who am I?" data is typically stored in an EEPROM (sometimes referred to loosely as a PROM by users/techs). That EEPROM often contains items such as:

• Model identification code (what the printer reports itself as)

• Region/market flags (which can affect model naming and driver identity)

• Ink configuration tables and initialization parameters

• Service/inspection mode flags and manufacturing configuration

• Various calibration and internal settings (sometimes tied to the mainboard/head pairing)

If the replacement mainboard came from a different regional variant, donor model, or production line setup, the EEPROM contents may be telling the firmware:
"I'm a PX-M5081F," so the USB identity and driver profile reflect that.

Your timeline also matters:

• You powered on into Recovery Mode

• You installed Recovery Firmware FA21N7

• The printer entered Inspection Mode

• After selecting Normal Mode, the identity mismatch became visible

That sequence strongly suggests the firmware/EEPROM pairing is now running with the wrong stored model identity.

Does Another PROM Need to Be Programmed?

In practical terms: yes-the EEPROM needs to be corrected (reprogrammed or replaced + programmed).

This usually means one of these paths:

1) Software-based recovery (only if the printer still communicates reliably)

Software methods can work only when the printer maintains stable USB communication and allows service-level access. The idea is to restore or rewrite the identity/config blocks without hardware programming.

However, once a printer is already presenting itself as another model and has gone through Recovery + Inspection Mode, software tools may or may not be able to fully correct the internal identity-especially if the EEPROM data blocks are inconsistent or partially corrupted.

2) Hardware-based EEPROM reprogramming (most direct fix)

If software can't restore correct model identity, the standard repair approach is:

• Use an EEPROM programmer to read/write the EEPROM data directly

• Write a known-good EEPROM dump from the correct model family (same platform and variant)

• In some cases, replace the EEPROM chip entirely and program the replacement

A commonly used ready-made EEPROM programmer option is something like an external programmer (example): EEPROM programmer on Amazon (https://amzn.to/43HA5nw).
(There are also DIY programmer approaches, but the main concept is the same: you need hardware access to the chip data.)

Why EEPROM Corruption Can Happen During Firmware/Recovery Updates

EEPROM corruption (or partial failure) can happen for a few reasons, especially during heavy write operations like a recovery flash:

• Cell wear / weak memory regions: EEPROM cells have finite write endurance. During recovery firmware operations, large blocks may be rewritten. If a portion of the EEPROM is weak, the rewrite can fail and leave corrupted or mismatched data.

• Interrupted or stressed update process: Power instability, timing issues, or repeated recovery attempts can increase write stress.

• Update/rollback complications: Epson has released updates over the years aimed at controlling cartridge behavior (including third-party cartridge blocking). When users attempt downgrades/rollbacks, the repeated rewriting can expose weak EEPROM areas. In some cases, this results in freezes, blinking, or communication failure.

In your case, the printer still boots and runs menus, so it's not a total failure-more like the printer is now operating with the wrong "identity package" in its non-volatile memory.

Can BCH Technologies Reprogram the EEPROM for This?

You are correct that the fix is EEPROM reprogramming, but we do not offer EEPROM reprogramming as a service. The reason is that doing this correctly requires model-specific dumps, correct board/chip handling, and a controlled process-otherwise it's very easy to brick the board or introduce unstable behavior later.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems, especially when mainboards, printheads, and firmware recovery procedures are involved. Because of this, we're not able to provide remote troubleshooting, step-by-step repair guidance, or hands-on support for printer repairs. We do offer an in-person evaluation and repair service through our local diagnostic facility-BCH Technologies Printer Repair Service (https://bchtechnologies.com/printer-repair-service). Due to high demand, we work on a first-come, first-served basis, and it may take a few weeks before we can accept your printer for drop-off. Our service options are structured to repair either the whole printer or specific parts, with clear instructions on how to proceed. That said, we recognize our rates aren't always the most economical path. For that reason, we strongly recommend self-help through online research when possible. You can start with YouTube or visit our BCH Technologies YouTube channel homepage (https://youtube.com/@bchtechnologies). Use the search icon near the "About" section on the right side of the menu to find videos by topic. I get many questions every day asking if I have a video for a specific issue, and after creating videos for over nine years, it's difficult to remember every single one-so YouTube's search tool is the fastest way to locate relevant content. It may also suggest helpful videos from other channels that apply to your situation.

Thank you again for reaching out and for supporting BCH Technologies. I truly appreciate the detailed information you provided-it makes it much easier to pinpoint what's happening and explain the most likely path forward.