android/audio: added various audio and android software and resources

wiki/android.md

@@ -10,6 +10,10 @@ The most used app store of android is the [Google Play Store](https://play.googl
 A free and open-source alternative to it is [F-Droid](/wiki/android/f-droid.md) which only features
 open-source software.
 
+A list of open-source software options is also available on Alberto Mosconis
+[Github](/wiki/git.md#server-with-web-interface) repository
+[foss apps](https://github.com/albertomosconi/foss-apps/tree/main).
+
 ## Multi-Factor Authentication
 
 [Multi-factor authentication](/wiki/multi-factor_authentication.md) can easily be set up on android
@@ -21,3 +25,48 @@ This app is available at [F-Droid](/wiki/android/f-droid.md) as
 [FreeOTP+](https://f-droid.org/de/packages/org.liberty.android.freeotpplus/) and on
 [Google Play Store](#app-store) by the
 [same name](https://f-droid.org/de/packages/org.liberty.android.freeotpplus/).
+
+## Custom ROMs
+
+Besites the stock-firmware of vendors there are also custom ROMs.
+These are alternative firmware variants made by third party providers.
+A well known custom ROM is [LineageOS](/wiki/android/lineageos.md).
+
+It is possible that some custom ROMs require the user to
+[unlock the bootloader](#unlocking-the-bootloader) before the installation can happen.
+
+## Unlocking the Bootloader
+
+Unlocking the bootloader can be a bit challenging for some vendors especially.
+
+For [smartphones and tablets](/wiki/smart_devices.md#smartphones-and-tablet-computers) made by
+Xiaomi there are some steps that have to be done to unlock the bootloader.
+This section is based on an
+[article about unlocking the bootloader](https://new.c.mi.com/global/post/101245) on Xiaomi
+Community aswell as another
+[article on specifics for HyperOS](https://xiaomiui.net/how-unlock-bootloader-xiaomi-hyperos-53493/).
+First the user has to apply to unlock the bootloader.
+For this open the Xiaomi Community app, navigate to the "Settings" and select "Change region".
+Select the region "Global".
+A new option called "Unlock bootloader" now appears in the settings.
+Select "Unlock bootloader" and "Apply for unlocking".
+It may be possible that a specified time has to be waited for the application process to happen.
+Next go to the phones settings.
+Navigate to "About Phone" and "MIUI Version", repeatedly tap on "MIUI version" to get into
+developer mode if the phone is not already in developer mode.
+Navigate to "Additional settings" and "Developer options".
+Enable "OEM unlocking" and "USB debugging".
+Now add your Xiaomi account to your device.
+To do so navigate to "Mi Unlock status" and agree then "Add account and device".
+Shutdown your phone and boot into "Fastboot" by holding down the volume down button and the power
+button.
+Then connect it to a computer via USB.
+The following steps have to take place on a [Windows](/wiki/windows.md) system or an emulation or
+virtualization of it.
+Download and start "Mi Unlock" - it is available on the
+[article mentioned prior in this section](https://new.c.mi.com/global/post/101245).
+Follow the steps of the software, select "Unlock" and confirm it multiple times.
+It is possible that now 72 hours have to pass for the unlocking process to continue.
+If that is the case wait the specified amount of time and repeat the last step.
+Make sure to not apply for unlocking again and do not add your account to your phone again as this
+will reset the timer.

wiki/android/launcher.md

@@ -0,0 +1,13 @@
+# Launcher
+
+A launcher is the software that controls the home screen and app drawer on an
+[Android](/wiki/android.md) phone.
+
+## Software Options
+
+This section lists various possible launchers.
+
+- [Kvaesitso](https://kvaesitso.mm20.de/) is a free and open-source launcher.
+  It is available on [F-Droid](/wiki/android/f-droid.md) from its
+  [repository](https://f-droid.org/de/packages/de.mm20.launcher2.release/).
+  It focusses on a search but also has the option to label apps with tags.

wiki/android/lineageos.md

@@ -0,0 +1,22 @@
+# LineageOS
+
+[LineageOS](https://lineageos.org/) - or short Lineage - is a custom
+[Android](/wiki/android.md)-ROM and operating system for
+[Smartphones and Tablets](/wiki/smart_devices.md#smartphones-and-tablet-computers) with mostly free
+and open-source software.
+It was formerly known as CyanogenMod.
+
+## Compatible Devices and Installation
+
+Lineage is only available on specific devices that feature a maintained build of LineageOS.
+A list of compatible devices sorted by vendor can be found on the
+[official wiki](https://wiki.lineageos.org/devices/).
+
+For installation navigate to the [official wiki](https://wiki.lineageos.org/devices/) and select
+the device LineageOS should be installed on.
+A guide will be available to help users in the process of installation.
+The device page also features any build file needed for the setup.
+If Google Services should be installed on the device close attention has to be payed in the guide
+section called "Installing Add-Ons".
+The Google Apps packages for Lineage can be downloaded from the
+[corresponding wiki page](https://wiki.lineageos.org/gapps/).

wiki/audio.md

@@ -13,7 +13,7 @@ For Linux specific music software navigate to the corresponding
 For voice based communication navigate to the [Communication article](/wiki/communication.md) and
 the corresponding [VoIP section](/wiki/communication.md#voip).
 
-## Headphone Audio Profiles
+## Headphone/In-Ear Monitor Audio Profiles and Reviews
 
 Headphones have different frequency responses.
 [AutoEq](https://github.com/jaakkopasanen/AutoEq/tree/master) can be used to normalize these to a
@@ -21,6 +21,11 @@ harman curve.
 AutoEq also has a [website](https://autoeq.app/) on which headsets can be searched and equalizer
 presets can be exported more easily.
 
+An extensive list of in-ear monitor reviews was made by crinacle.
+It is called [crinacle's ranking list IEMs & Earphones](https://crinacle.com/rankings/iems/).
+A similar list for headphones was also made by crinacle.
+It is called [crinacle's ranking list Headphones](https://crinacle.com/rankings/headphones/).
+
 ## Media Software
 
 If you want to keep your system clean of much data, you can use this kind of