First time hot air (de)soldering

[Mirenia]

Short update:
I got managed to desolder, flash and solder it back onto the board.

I think it doesn't look to bad for my first time.
But unfortunately the laptop is now completely dead. Maybe I somehow shortened or damaged something while working on it, but I will check this out.

Attached picture is the back soldered chip

Thanks a lot for your advices!!!

[stj]

it's not so much about if it's unleaded,
laptops are made using shit solder, probably ground-up tin with no copper content.
i wouldnt be surprised if they even use re-cycled solder somehow to create the industrial solder paste!

put fresh solder on it with an iron - then use the hot air to lift it.
then braid all the solder off and use decent solder when you re-fit the part.

[diif]

Unless you are replacing the unleaded solder with leaded then you won't need to change the temperature.

[harp]

And what else should I pay attention to?

Side note only:
Protect nearbly component from heat, like electrolitc capacitor, connector, stickers, wire... with aluminium foil/shield or remove it from warm zone...
Before desoldering do generaly measurements of all relevant data, write on paper measure readings like in diode mode or voltage, resistance... of chip legs or on rail etc... so you can check it after soldering and compare.
Take a note of orientation of component, and nearbly components... a few sharp pictures will be fine. Sharp. You can post here before/after pictures to encourage others to proceed.
It is wery common to nockout nearbly component in the process or blow it away...
I suggest that wear safety glasses while hotairing, sometimes small components with no reasons explode.

And then fun starts

[Mirenia]

Hello everyone,
I am trying to save my broken laptop and would like to desolder the WSON8 BIOS chip in order to repair the BIOS with a programmer.

I have now purchased a hot air soldering station (YIHUA 959D-II) for this purpose. I have already practiced a little on a broken board and desoldered components with it.
(350C with medium airflow and within a few seconds I was able to lift off the components with tweezers)

Now I'm afraid of destroying the BIOS chip if I desolder it too hot or for too long.
Do you have any tips on which nozzle size, temperature and air flow I should use when desoldering and, of course, when soldering back in?
And what else should I pay attention to?

I'm grateful for any tips