gente con problemas de bloqueo de bios dell latitude c610, aca les dejo instrucciones de como hacer el proceso para eliminar ese frustrante problema... espero les sirva.!!
NOTA: TRADUCCIR PORQUE ESTA EN INGLES...!!
just gotta jumper pin 3 and pin 6 on the "24c02", or "24u05", or the "24c164" or whatever chip resides in the location marked "upw1" (i think it stands for "unremovable password" lol) at least that's what it was on my D500... You really have to do some looking for it, mine was behind the PCMCIA slot.. only had to take the keyboard, one heatsink, and the pcmcia slot off.. then lift back the plastic, Carefully soldier wires to pin 3 and 6, then route them outside (i went through the fan opening), then put it all back together. then press the power button, short the wires for 2 seconds, then it "should" say "***Manufacturing Mode - Level *** Press Fn-X to return to normal mode" then when you see this, press F2, after bios comes up, press ESC, choose "Save and exit" then reboot... if "manufacturing mode" still comes up press Fn-X and it will exit that mode. you may have to mess with it a few times, but don't leave the wires shorted for more than 2 seconds. "the first time i did it i got a overheating warning, and it was gonna be shut down.. don't worry bout that, you've come this far, try it again... it actually came up for me by doing the following
Step 1. press power.
Step 2. short wires 2 seconds.
Step 3. disconnect wires, wait 2 seconds.
Step 4. short wires again for 2 seconds,
Step 5. disconnect and wait for "Maintenance Mode" text.
Step 6. Hit F2 (tiene que presionarlo varias veces hasta que salga la pantalla del BIOS)
Step 7. Hit ESC, Choose save and exit
Step 8. Enjoy your unlocked Laptop (with NO service Tag)