BCM4312 EEPROM corruption recovery help - HP Mini 110 U98Z049.00

BCM4312 EEPROM corruption recovery help - HP Mini 110 U98Z049.00

[Zedequias Marin (DECO)]

Dear Linux Wireless Developers,

I found your 2011 thread about BCM4312 issues and need help recovering
from EEPROM corruption.

My Device: HP Mini 110
WiFi Card: Broadcom BCM4312 802.11b/g LP-PHY (14e4:4315)
Subsystem: Hewlett-Packard Company U98Z049.00

Problem: I corrupted the EEPROM while trying to configure as WiFi
repeater. The card is detected but no wireless interface is created.
EEPROM shows repetitive FF/3F patterns.

Request: Could anyone provide a known good EEPROM dump for BCM4312
(14e4:4315) specifically for HP Mini 110/U98Z049.00, or guidance on
EEPROM recovery?

I have EEPROM backups and can provide diagnostic info.

Thank you for your help!

Best regards,
Zedequias Marin
From Sao Paulo, Brazil

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Re: BCM4312 EEPROM corruption recovery help - HP Mini 110 U98Z049.00

[Michael Büsch]

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On Sun, 2 Nov 2025 10:27:10 -0300
"Zedequias Marin (DECO)" <dudecco@gmail.com> wrote:

> I found your 2011 thread about BCM4312 issues and need help recovering
> from EEPROM corruption.
> 
> My Device: HP Mini 110
> WiFi Card: Broadcom BCM4312 802.11b/g LP-PHY (14e4:4315)
> Subsystem: Hewlett-Packard Company U98Z049.00
> 
> Problem: I corrupted the EEPROM while trying to configure as WiFi
> repeater. The card is detected but no wireless interface is created.
> EEPROM shows repetitive FF/3F patterns.
> 
> Request: Could anyone provide a known good EEPROM dump for BCM4312
> (14e4:4315) specifically for HP Mini 110/U98Z049.00, or guidance on
> EEPROM recovery?
> 
> I have EEPROM backups and can provide diagnostic info.

Hi,

the PCI ID (14e4:4315) is stored in the wireless device's serial EEPROM.
If the EEPROM is corrupted, you need to find out which PCI ID it uses now.
You can do that with lspci -nn.
Once you found out which corrupted PCI ID your device uses, you can register this
new PCI ID to the b43 driver via sysfs to recognize (see PCI/sysfs documentation).

Then the driver will recognize your device again and you can flash the original
serial EEPROM to the device. See b43-tools/ssb_sprom documentation [1].

[1] https://github.com/mbuesch/b43-tools/tree/master/ssb_sprom

-- 
Michael Büsch
https://bues.ch/

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