Lenovo T480s
Model 20L8-S3TE00
Board ET481-U10
Chip MX25L12873F

Hi, I have a few of these & they came with a custom bios boot logo, no passwords etc.

2 x were brand new unused but with custom boot logo, 1 I installed Windows/ran updates then it bricked itself. 1 wouldn't get past the custom bios boot logo.

The third I loaded windows, took a backup of the bios chip, then tried to flash several different clean bios's via programmer which all caused it to not boot. I tried to reflash the original bios both using clip & desoldering but...

Re: Hp ellİtebook 840 g5 bios password

@Vesko356 Thanks, guess it's time to buy a microscope..



Thanks also, will order those values & be more careful....

Re: Hp ellİtebook 840 g5 bios password



Thank you everyone for your help, I tried reflashing my backup & resoldering but the same problem....

Re: Hp ellİtebook 840 g5 bios password



Thanks, I tried this- now the keyboard/powerlights come on, then the power light flashes orange 30 times, then 7 times & it powers off.

I haven't flashed the 16MB chip yet as I wanted to make sure I fixed this problem first, but should I flash it to work with your file?

Thanks again...

Re: Hp ellİtebook 840 g5 bios password



Thank you very much.

I soldered back the 32MB chip but maybe I killed it as now I get flashing power light. Will have to try a new chip before I flash the other 16MB I think....

Re: Hp ellİtebook 840 g5 bios password

Hi all,

Could someone please confirm which chip (or both?) I should be flashing? Seems to be differing views unless I missed something.

I used HPUnlocker on the 32MB 25Q256JV, resoldered & now the laptop has a blank screen & fans on high.

I then tried to use RCU on the same chip as per one of the suggestions, but that doesn't work, telling me I should be flashing the 16MB chip.

So do I need to do the 32MB chip, 16MB, or both?

Thanks!...