Questions tagged “Password”

0votes

1 answer

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Transceiver notes: I2C addresses, password unlock bytes and known default passwords for SFP EEPROM

A notes repository on hacking SFP/QSFP EEPROM: SFPs present EEPROM at I2C 0x50 and DOM plus vendor/password features at 0x51; locked moddules need a 4-byte password written to 0x51 bytes 0x7b-0x7e. It lists several known unlock passwords and evaluates write methods (off-the-shelf coder limited to…

rxadmin25 ES asked 27 days ago

0votes

1 answer

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Writing to password-protected SFP/QSFP/XFP: where the password lives and how brute force works

Users needed to write to password-protected SFP/QSFP/XFP modules from HP, Cisco, Finisar and JDSU. The thread documents the two protection levels: a host/user password protecting the user-writable area (A2h offset 7Bh on SFP, A0h offset 7Bh on QSFP/XFP) and a manufacturer password protecting the…

a2h-7bh brute-force Password revelprog-is reveltronics

nethawk74 EG asked 27 days ago

3votes

5comments

143views

Programmer returns WRITE FAIL on an SFP+ that dumps cleanly: dead EEPROM or something blocking writes?

We recode a small batch of modules for customer hosts most months, nothing exotic: read the original page, write the vendor string the host wants, put the module in the switch and move on. One module out of the current batch refuses every write while reading back perfectly, and before I bin it I…

EEPROM Password Programmer SFP+ write-protect

rxnode71 UA asked 1 month ago