Alex(k$ei) Mishakov amishakov

Downgrade and dualboot status of almost all iOS devices

UPDATED: 2025-04-04

Reddit mirror: https://www.reddit.com/r/iOSDowngrade/comments/j1x7iv/downgrade_and_dualboot_status_of_almost_all_ios/
GitHub Gist mirror: https://gist.github.com/LukeZGD/9d781f1b03a69fa46869384a9407a41a
As of updating this post, there is now a free downgrade tool that utilizes a SEP exploit released for A9-A10X devices, turdus merula: https://sep.lol/
- Untethered with blobs guide: https://ios.cfw.guide/turdusmerula/
- Tethered guide: https://ios.cfw.guide/turdusmerula-tethered/
Save SHSH blobs for signed iOS versions using TSS Saver or blobsaver

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

Looking to create a Software RAID 1 setup for your 2-disk server on Ubuntu Server 20.04?

Let's start with the basics: the official guide by Ubuntu (https://ubuntu.com/server/docs/install/storage) is outdated/wrong. And as of March 2021 it's possible that there's a bug as well with how the bios_grub partitions are created when using multiple disks.

Now on to the solution:

Select "Custom storage layout" when you reach the storage configuration step of the installer.
If the disks have existing partitions, click on each disk under AVAILABLE DEVICES and then select REFORMAT. This will (temporarily) wipe out the partitions.

Warning

Following instructions are provided without any warranty, and may even get you in trouble legally. The instructions are provided for testing, and should be use with care. We (including commentators) are not responsible for any damage to your device(s).

Introduction

This may enable additional channels and power (in most cases don't) on ASUS Merlin provided routers.

	telnet 192.168.8.1
	mount -o remount,rw /system /system
	busybox sh
	printf "\n#Change MAC address to unique one\nsleep 10 && ip link set br0 address ba:ab:be:34:00:00" >> /system/etc/autorun.sh
	exit
	mount -o remount,ro /system /system
	reboot

	#!/bin/bash

	# Short URL: https://git.io/fjY3J
	#
	# ~ For Ubuntu 18.04 or newer ~
	#
	# How to use:
	# $ cd ~/Downloads
	# $ wget -O bootstrap.sh https://git.io/fjY3J
	# $ chmod +x bootstrap.sh

	MySQL Operations
	--------------------------------------
	In this document:
	- Export/Import DB
	- Export/Import Table from DB
	- mysqladmin
	- Repair DB
	--------------------------------------

	# === Optimized my.cnf configuration for MySQL/MariaDB (on Ubuntu, CentOS, Almalinux etc. servers) ===
	#
	# by Fotis Evangelou, developer of Engintron (engintron.com)
	#
	# ~ Updated December 2021 ~
	#
	#
	# The settings provided below are a starting point for a 8-16 GB RAM server with 4-8 CPU cores.
	# If you have different resources available you should adjust accordingly to save CPU, RAM & disk I/O usage.
	#

	server {
	listen 80;
	server_name kirby.dev www.kirby.dev;
	root /path/to/www/kirby;

	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log;

	# Route LetsEncrypt ACME Challenges to the right place
	location ^~ /.well-known/acme-challenge/ {