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How to self-load non-freeware firmware on existing netinst ISO installer

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I have another laptop which dual boot with Fedora and Windows10, it is not
my primary laptop since 9 months ago and I haven't used it since then. I
plan to fully install Debian testing on this machine because this laptop
has dual graphic cards (optimus) and theoretically, with Debian 11 (or
newer), special configuration shouldn't be needed and offloading should be
available as soon as you've installed the proprietary drivers[1]. This
machine has a faulty LAN port and only 1 of 3 USB ports are usable. So I
can only use 1 USB per time and only WIFI for the network connection.

Since Debian provides an unofficial netinst image for i386/amd64/powerpc
with the non-free firmware, I go and download the ISO[2] and make a
bootable USB installer.

But when I during the installation process (on "detect network hardware"
phase),   debian-installer dialog  asked me to load 2 firmware which is
iwIwifi-2030-6.ucode and  iwIwifi-2030-5.ucode  .. I feel perplexed about
this. So I checked the USB, it already have the firmware but with deb
package format:

/firmware/firmware-iwlwifi_20201218-3_all.deb
/pool/non-free/f/firmware-nonfree/firmware-iwlwifi_20201218-3_all.deb

Seems this firmware load on the next stage which is after network setup and
after do the partitioning stuff. I wonder why, since this is netinst I need
network working from the during installation process, not after that.

Question :
a) Is it possible to do self modification on the installation script so the
wifi chip will be available and working during the installation process so
I can pull the packages that I want during installation from Debian mirror.
If yes, how and if no, please suggest me some solutions that don't need me
to fix LAN port, buy cable and router (since I use wifi hotspot from my
phone)

The precompile firmware are available here[3] and here[4]

TLDR; I want  firmware-iwlwifi  already loaded and working during Debian
installation phase, not after install.

[1] https://wiki.debian.org/NVIDIA%20Optimus#PRIMEOffload
[2]
http://cdimage.debian.org/cdimage/unofficial/non-free/images-including-firmware/weekly-builds/amd64/iso-cd/firmware-testing-amd64-netinst.iso
[3]
https://wireless.wiki.kernel.org/_media/en/users/drivers/iwlwifi-2030-ucode-18.168.6.1.tgz
[4] https://github.com/OpenELEC/iwlwifi-firmware/tree/master/firmware

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How to self-load non-freeware firmware on existing netinst ISO installer Robbi Nespu <robbinespu@gmail.com> - 2021-02-24 16:10 +0100
  Re: How to self-load non-freeware firmware on existing netinst ISO installer Kenneth Parker <sea7kenp@gmail.com> - 2021-02-24 16:40 +0100
    Re: How to self-load non-freeware firmware on existing netinst ISO  installer Robbi Nespu <robbinespu@gmail.com> - 2021-02-25 03:50 +0100
  Re: How to self-load non-freeware firmware on existing netinst ISO  installer Brian <ad44@cityscape.co.uk> - 2021-02-24 17:10 +0100
    Re: How to self-load non-freeware firmware on existing netinst ISO  installer John Boxall <jboxall47@gmail.com> - 2021-02-24 17:20 +0100
      Re: How to self-load non-freeware firmware on existing netinst ISO  installer Brian <ad44@cityscape.co.uk> - 2021-02-24 17:30 +0100
        Re: How to self-load non-freeware firmware on existing netinst ISO  installer Robbi Nespu <robbinespu@gmail.com> - 2021-02-25 04:40 +0100
      Re: How to self-load non-freeware firmware on existing netinst ISO  installer Robbi Nespu <robbinespu@gmail.com> - 2021-02-25 04:00 +0100
    Re: How to self-load non-freeware firmware on existing netinst ISO  installer Robbi Nespu <robbinespu@gmail.com> - 2021-02-25 04:00 +0100
      Re: How to self-load non-freeware firmware on existing netinst ISO  installer David Wright <deblis@lionunicorn.co.uk> - 2021-02-25 05:50 +0100
        Re: How to self-load non-freeware firmware on existing netinst ISO  installer [SOLVED] Robbi Nespu <robbinespu@gmail.com> - 2021-02-25 11:20 +0100
        Re: How to self-load non-freeware firmware on existing netinst ISO  installer Brian <ad44@cityscape.co.uk> - 2021-02-25 15:40 +0100
          Re: How to self-load non-freeware firmware on existing netinst ISO  installer Brian <ad44@cityscape.co.uk> - 2021-02-26 14:10 +0100
          Re: How to self-load non-freeware firmware on existing netinst ISO  installer David Wright <deblis@lionunicorn.co.uk> - 2021-03-01 01:40 +0100
            Re: How to self-load non-freeware firmware on existing netinst ISO  installer Charles Curley <charlescurley@charlescurley.com> - 2021-03-01 04:00 +0100
            Re: How to self-load non-freeware firmware on existing netinst ISO  installer Brian <ad44@cityscape.co.uk> - 2021-03-01 15:20 +0100
              Re: How to self-load non-freeware firmware on existing netinst ISO  installer David Wright <deblis@lionunicorn.co.uk> - 2021-03-01 18:00 +0100
                Re: How to self-load non-freeware firmware on existing netinst ISO  installer Brian <ad44@cityscape.co.uk> - 2021-03-01 21:50 +0100
  Re: How to self-load non-freeware firmware on existing netinst ISO installer Semih Ozlem <semihozlemlinuxuser@gmail.com> - 2021-02-26 06:50 +0100

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