0. установить android-tools
sudo dnf install android-tools

1. включить режим разработчика
2. отладка по USB - включить
3. root$ adb devices -l
4. root# adb shell


Посмотреть список установленных пакетов:
pm list packages | sed -e 's/package://g' | sort -n

Лучше не удалять, а запретить системные неиспользуемые:
pm disable-user --user 0 com.huawei.android.launcher
pm disable-user --user 0 com.huawei.android.thememanager
pm disable-user --user 0 com.huawei.systemmanager
# кнопка "поделиться"
pm disable-user --user 0 com.huawei.android.internal.app 
pm disable-user --user 0 com.huawei.systemserver
pm disable-user --user 0 com.huawei.hwasm
pm disable-user --user 0 com.huawei.languagedownloader
pm disable-user --user 0 com.swiftkey.swiftkeyconfigurator
pm disable-user --user 0 com.touchtype.swiftkey
pm disable-user --user 0 com.android.carrierconfig

Удалить ненужные:
pm uninstall -k --user 0 com.amazon.aa
pm uninstall -k --user 0 com.amazon.aa.attribution
pm uninstall -k --user 0 com.android.egg
pm uninstall -k --user 0 com.android.mediacenter
pm uninstall -k --user 0 com.baidu.input_huawei
pm uninstall -k --user 0 com.booking
pm uninstall -k --user 0 com.ebay.mobile
pm uninstall -k --user 0 com.facebook.appmanager
pm uninstall -k --user 0 com.facebook.katana
pm uninstall -k --user 0 com.facebook.orca
pm uninstall -k --user 0 com.facebook.services
pm uninstall -k --user 0 com.facebook.system
pm uninstall -k --user 0 com.google.android.apps.tachyon
pm uninstall -k --user 0 com.google.android.music
pm uninstall -k --user 0 com.google.android.play.games
pm uninstall -k --user 0 com.google.android.videos
pm uninstall -k --user 0 com.hicloud.android.clone
pm uninstall -k --user 0 com.huawei.android.FloatTasks
pm uninstall -k --user 0 com.huawei.android.hsf
pm uninstall -k --user 0 com.huawei.android.hwaps
pm uninstall -k --user 0 com.huawei.android.hwpay
pm uninstall -k --user 0 com.huawei.android.karaoke
pm uninstall -k --user 0 com.huawei.android.projectmenu
pm uninstall -k --user 0 com.huawei.android.remotecontroller
pm uninstall -k --user 0 com.huawei.android.tips
pm uninstall -k --user 0 com.huawei.android.totemweather
pm uninstall -k --user 0 com.huawei.appmarket
pm uninstall -k --user 0 com.huawei.arengine.service
pm uninstall -k --user 0 com.huawei.autoinstallapkfrommcc
pm uninstall -k --user 0 com.huawei.carrierconfig
pm uninstall -k --user 0 com.huawei.contacts.sync
pm uninstall -k --user 0 com.huawei.featurelayer.sharedfeature.baidu
pm uninstall -k --user 0 com.huawei.featurelayer.sharedfeature.map
pm uninstall -k --user 0 com.huawei.fido.uafclient
pm uninstall -k --user 0 com.huawei.gameassistant
pm uninstall -k --user 0 com.huawei.geofence
pm uninstall -k --user 0 com.huawei.health
pm uninstall -k --user 0 com.huawei.hicard
pm uninstall -k --user 0 com.huawei.hidisk
pm uninstall -k --user 0 com.huawei.hifolder
pm uninstall -k --user 0 com.huawei.himovie.overseas
pm uninstall -k --user 0 com.huawei.hitouch
pm uninstall -k --user 0 com.huawei.hiview
pm uninstall -k --user 0 com.huawei.hiviewtunnel
pm uninstall -k --user 0 com.huawei.hwdetectrepair
pm uninstall -k --user 0 com.huawei.hwid
pm uninstall -k --user 0 com.huawei.hwstartupguide
pm uninstall -k --user 0 com.huawei.iaware
pm uninstall -k --user 0 com.huawei.KoBackup
pm uninstall -k --user 0 com.huawei.mirror
pm uninstall -k --user 0 com.huawei.numberidentity
pm uninstall -k --user 0 com.huawei.parentcontrol
### HiSuite
pm uninstall -k --user 0 com.huawei.pcassistant
pm uninstall -k --user 0 com.huawei.phoneservice
pm uninstall -k --user 0 com.huawei.powergenie
pm uninstall -k --user 0 com.huawei.search
pm uninstall -k --user 0 com.huawei.stylus.floatmenu
pm uninstall -k --user 0 com.huawei.synergy
pm uninstall -k --user 0 com.huawei.tips
pm uninstall -k --user 0 com.huawei.vassistant
pm uninstall -k --user 0 com.huawei.videoeditor
pm uninstall -k --user 0 com.huawei.wallet
pm uninstall -k --user 0 com.huawei.watch.sync
pm uninstall -k --user 0 com.instagram.android
pm uninstall -k --user 0 com.ironsource.appcloud.oobe.huawei
pm uninstall -k --user 0 com.microsoft.translator
pm uninstall -k --user 0 com.netflix.mediaclient
pm uninstall -k --user 0 com.netflix.partner.activation
pm uninstall -k --user 0 com.snapchat.android
pm uninstall -k --user 0 com.twitter.android
pm uninstall -k --user 0 org.smsalliance.openmobileapi.service
pm uninstall -k --user 0 com.yandex.browser
pm uninstall -k --user 0 ru.yandex.searchplugin
pm uninstall -k --user 0 com.my.games.vendorapp
pm uninstall -k --user 0 com.android.partnerbrowsercustomizations.tmobile
pm uninstall -k --user 0 com.android.huawei.HiMediaEngine
pm uninstall -k --user 0 com.huawei.android.instantshare
pm uninstall -k --user 0 com.huawei.featurelayer.featureframework
pm uninstall -k --user 0 com.huawei.android.mirrorshare
pm uninstall -k --user 0 com.huawei.android.pushagent
pm uninstall -k --user 0 com.huawei.nb.service
pm uninstall -k --user 0 com.huawei.nearby
pm uninstall -k --user 0 com.allgoritm.youla
pm uninstall -k --user 0 com.huawei.motionservice
pm uninstall -k --user 0 com.huawei.ims
pm uninstall -k --user 0 com.huawei.imedia.sws

Т.к. на новых постоплатных тарифах Билайн интернет безлимитный, то раздачу интернета по wi-fi (телефон в режиме модема) они сделали платной.
Выходим из положения с помощью любого из приведенных способов:
  1. Корректируем TTL телефона, установив, например, приложение TTL Editor.
  2. Корректируем IMEI модема, заменив на IMEI телефона. Приложение QPST

  1. Скачайте и установите программу QPST (Скачать программу можно здесь);
  2. Запустите QPST Configuration. Откройте меню Пуск, затем нажмите на вкладку «Все программы», найдите QPST и дважды щелкнете левой кнопкой мышки на QPST Configuration;
  3. Откройте диспетчер устройств, перейдите во вкладку Порты (COM и LPT). Найдите номер порта (для Huawei-3G Application Interface);
  4. Если номера порта отсутствует, нажмите кнопку «Добавить новый порт» (Add New Port);
  5. Далее выберите COM порт который соответствует 3G Application Interface;
  6. Нажимаем «Start Clients» в верху;
  7. Выбиравем «RF NV Item Manager»;
  8. Нажимаем Setting-Comport-Выбираем порт;
  9. Дальше нажимаем «File-Read From Phome»;
  10. Запуститься процесс чтения\обработки NV item из модема. В отображаемом результате мы не увидим нужный нам пункт (NV_UE_IMEI_I);
  11. Опять нажимаем «File» и выбираем «Read Supported RF NV Items»;
  12. Выбираем (NV_UE_IMEI_I);
  13. Здесь вы увидите в правой части 9 пустых полей (если у вас нету IMEI). Если IMEI есть, то просто вводим новый;
  14. Ставим галочку в окошечке «Hex» и в пустых полях пишем новый IMEI. Но писать надо не в оригинальном формате, а в Hex формате. В первом поле обязательно ввести значение — 8. Во втором поле первая цифра вашего IMEI в таком виде — 3A. В пятом окне вводиться одна цифра значения (в оригинальном IMEI это 4ый набор знаков, как правило десятки (10,20...80,90). В остальные окна цифры вводятся в зеркальном отображении. Пример: настоящий IMEI — 3 23 54 30 15 61 53 37, нужно ввести — 8 3A 32 45 3 51 16 35 73;
  15. IMEI ввели, опять нажимаем «File» и выбираем «Write Only Listed NV Item To Phone».

Качаем прошивку bootloader:
https://twrp.me/Devices/

На телефоне одновременно зажимаем кнопку громкости "-", кнопку питания и кнопку меню.
Перезагружаем телефон в  режиме bootloader mode и подключаем к USB компьютера

sudo dnf install android-tools heimdall heimdall-frontend

Сначала нужно разлочить загрузчик:
sudo fastboot oem unlock

Прошиваем загрузчик:
Способ 1:
sudo fastboot flash recovery twrp-3.2.1-1-i9300.img

Способ 2:
sudo heimdall flash --RECOVERY twrp-3.2.1-1-i9300.img

Заходим в браузер на компьютере, выбираем наше устройство для прошивки OS LineageOS:
https://download.lineageos.org/

Выбираем GoogleApps под нашу архитектуру (ARM, nano):
http://opengapps.org/

Затем 2 скачанных архива копируем на телефон.
На телефоне одновременно зажимаем кнопку громкости "+", кнопку питания и кнопку меню.
Попадаем в меню TWRP, нажимаем Install.

This is tut on how to unlock bootloader and how to install ROM/Kernel for Neo L

First some basics:
Device: Neo L
Code Name:Phoenix
Code id:MT25i

CWM: CWM is used to flash Zip files(ROM) to your device for more info reffer
http://www.addictivetips.com/mobile/what-is-clockworkmod-recovery-and-how-to-use-it-on-android-complete-guide/
Custom Kernel; Apart from Sony Developers takes Source code of Kernel(Google) and make custom kernels. To install them you have to unlock bootloader(http://unlockbootloader.sonymobile.com/ )
Rom: It can come basically in zip files Official releases come in *.ftf extension. ftf file can be single Kernel file or all zip files, Zip files can be flashed to our device using CWM, copy it into SD card and flash(reffer the CWM section and links)
Unlocking bootloader(http://unlockbootloader.sonymobile.com/ ) Read carefully about warranty: the first 14 digits (remove the last digit) of your phone’s IMEI number.
Follow instructions there and get the unlock code. Get this app from Xda(http://forum.xda-developers.com/showthread.php?t=1560613 ) , the code you have obtained from Sony website. Paste it in the box and connect your phone.. to it while pressing Vol down button to see the LED(if that does not work press vol up key and reconnect) then click unlock. your mobile is unlocked.

Apart from Sony’s Rom we have Cyanogen Mode ROM and AOKP, to have then you need to install respective kernel--> Have to unlock bootloader.
Currently Gamers are recomendted to try AOKP Rom

 

 

First, you should confirm that it is possible to unlock the boot loader of your phone by checking the service menu. In your phone, open the dialler and enter *#*#7378423#*#* to access the service menu.

In your phone, tap Service info > Configuration > Rooting Status. If Bootloader unlock allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked.

On your computer, click Continue at the bottom of this page to start the unlock boot loader process.

Read through the information in the pop up window and click Yes, I’m sure, if you are still confident you want to unlock the boot loader.

Read through and accept the legal terms. Click I Accept.

Enter your name, email address and the first 14 digits (remove the last digit) of your phone’s IMEI number. Click Submit. You can view the IMEI number by entering *#06# on your phone.

The unlock boot loader key is displayed. Write it down and save it for later use.

Download and install the latest Android SDK from
http://developer.android.com/sdk/index.html
http://dl.google.com/android/installer_r20.0.3-windows.exe

Download and unzip this file. This is the standard android_winusb.inf-file, with a few lines of code added to enable Fastboot to support Sony and Sony Ericsson devices. Make sure you are running Google USB Driver package revision 4 or higher in your Android SDK. You can see current Google USB Driver package revision in the SDK Manager.
This is the standard android_winusb.inf-file, with a few lines of code added to enable Fastboot to support Sony and Sony Ericsson devices.
http://dl-developer.sonymobile.com/drivers/downloadinf.zip

Place the unzipped file in the usb_driver folder, located in the Android SDK > extras > google folder on your computer. Accept to replace the old android_winusb.inf-file with the new file. If you can't find the usb_driver folder, please install the Google USB Driver Packager using the Android SDK manager.

Turn off your phone.

On your phone, push and hold the unlock button* at the same time as you connect the phone to the computer with a USB-cable. The unlock button may differ between different phone models. See the note in the bottom of this page for more information on what button use on your phone.

On your computer, you will be asked for drivers. Point to the usb_driver folder where you placed the android_winusb.inf-file, and select the Android Boot loader Interface-file.

Open a command window and go to the tools folder within the Android SDK folder.
Enter fastboot.exe -i 0x0fce getvar version, and verify that you get a response back (for example "0.3"). This means your phone is connected properly.

Warning! If you perform this step, you will unlock the boot loader. This may void your warranty and/or any warranty from your operator. If you still want to unlock the boot loader of your phone, enter fastboot.exe -i 0x0fce oem unlock 0xKEY, where KEY is the unlock boot loader key you got in the beginning of this instruction. The boot loader should now be successfully unlocked.


* Hold the following button while connecting your phone to a computer with a USB-cable:

Menu button (for smartphone like Xperia™ arc, Xperia™ arc S, Xperia™ neo, Xperia™ neo V, Xperia™ pro).
Search button (for Xperia™ PLAY).
Volume up button (for smartphones like Xperia™ mini, Xperia™ mini pro, Xperia™ ray, Xperia™ active, Live with Walkman™, Xperia™ S).