Dell OptiPlex GX520 & GX620: CPU Upgrade to P4 and Pentium D

[DeathBringer]

OK. Try this:
◦Power off the system from the power button or the wall jack.
◦Disconnect the power cable from the wall jack and remove all the cables connected to the back of system tower including the power cable.
◦Press and hold the power button pressed for 30 seconds.
◦Connect the power cable, keyboard and monitor cable only.
◦Power on the system and see if it works.

[SeñorBIG]

I tried. no luck. I don't think that option is available on this dell pc

[DeathBringer]

I've found that Phoenix Tool can used for Dell BIOS. I've made BIOS mod. But I don't sure that it will work. On failure you'll receive a dead motherboard.

[SeñorBIG]

hmm i wonder if there is a bios recovery for this motherboard?

[DeathBringer]

I don't know anything about bios recovery on GX520.

[SeñorBIG]

the short story is, It works!

Strange that when i first ran the update, windows refused to shut down. I turned off the PC manually and turned it back on. The PC had a blank screen and long beeps. I removed the CMOS and then restarted. It booted to windows and i ran the update again. This time it flashed the bios just fine.

I just tested it using a Pentium D 945. works fine with no incompatible processor screen!

[DeathBringer]

Great news! Post new topic in Confirmed CPU Support Upgrades. And attach modded BIOS to topic.
I just change one byte in 0B_9.ROM module
Original:

Code:

7FCD     jnz  short 7FE7

Modded:

Code:

7FCD     jnz  short 7FCF

[SeñorBIG]

I just shut off the system and pulled all of the plugs including the power plug and left it off for 10 minutes. Plugged everything back in and it tested fine!

DeathBringer, Thank you so much. I can't thank you enough! do you accept donations or anything?

[DeathBringer]

Just post new topic in Confirmed CPU Support Upgrades with attached modded BIOS to topic.

[talkbios]

Great news! Post new topic in Confirmed CPU Support Upgrades. And attach modded BIOS to topic.
I just change one byte in 0B_9.ROM module
Original:

Code:

7FCD jnz short 7FE7

Modded:

Code:

7FCD jnz short 7FCF

how did you change this? what tool do you use to change it? I dont see that option in phoenixtool.exe

will this work on another dell mb that has incompatible CPU boot errors but runs fine