sogaiu

SM-G950F dreamlte

https://www.gsmarena.com/samsung_galaxy_s8-8161.php

unlock bootloader

• https://www.getdroidtips.com/how-to-unlock-bootloader-on-samsung-galaxy-phones/
• https://magiskzip.com/install-twrp-recovery-on-samsung-galaxy-s8/ - search for "Unlock the Bootloader"

ventoy was quite nice, but:

• issues with secure boot
• somewhat unclear status regarding the bits involved
  • 1
  • 2

thus the search for alternatives:

• https://github.com/Mexit/MultiOS-USB - looks like best bet atm (for windows, secure boot needs to be disabled during install?)

• version: sm-a515f/dsn (global)

• gsmarena page https://www.gsmarena.com/samsung_galaxy_a51-9963.php

• about rooting samsung devices (via installation of magisk): https://topjohnwu.github.io/Magisk/install.html#samsung-devices

  Installing Magisk WILL trip your Knox Warranty Bit, this action is not > reversible in any way.

apparently in one of the 2022 data breaches for samsung, version 4 of the odin tool (though this one is for linux, unlike the leaked 3.x program) was leaked. someone posted it (or something claiming to be it) to:

• https://xdaforums.com/t/official-samsung-odin-v4-1-2-1-dc05e3ea-for-linux.4453423/

there is a fork of the heimdall tool (maintained):

#! /bin/sh

# adapted from:
#
#   https://www.baeldung.com/linux/qemu-from-terminal

# create .qcow2 file by:
#
#   qemu-img create -f qcow2 debian-13.0.0-amd64.qcow2 20G

Wanted to get a basic firewall setup (like the default that gufw provides) but via nftables, which likely means using the nft command line tool [1]. Rather than just copy-paste some example (which needing locating first in any case) though, it seemed like a better idea to understand enough detail so that whatever was settled on could be maintained / modified over time.

There is an official wiki with plenty of information, but unfortunately, for me it wasn't a very useful resource for learning initially.

Here is a simple example:

• goal: make own data small enough to fit on small usb memory / micro sdhc
• why: see below

• random
  • sometimes just backing up lists of things instead of the things themselves might be enough to reduce space (e.g. may be there's are books or other things that could be obtained in the future but storing the media could increase storage size)

• Using QEMU - Dr. Mike Murphy

• docs

  • top
  • qemu-system-x86_64

• virtual console stuff

  • https://www.qemu.org/docs/master/system/keys.html

• https://askubuntu.com/questions/54814/how-can-i-ctrl-alt-f-to-get-to-a-tty-in-a-qemu-session

want to ensure certain secure boot related certificates are up to date before 2026-06-24

at present (2026-05), if one has a windows 11 installation, first:

• go to: windows security app > device security > secure boot

• check state - see the sort-of-table that has down arrow things to click to reveal. check the "fully updated" one first. if the message matches what is seen on the machine, nothing left to do. otherwise check the other ones below "fully updated"

  • on one lg 15 inch notebook, currently see: > Secure Boot is on, but your device is using an older boot trust configuration that should be updated. There is not yet enough data to classify your device for automatic update. Visit the link below for more information.