ROOT LG L90

• Format sdcard using into ext2.

  mkfs.ext2 /dev/sdX1

• Download update.zip
  Move it to your ext2 sdcard
  
  
• Install Android SDK or
  
  • for Debian Wheezy:
    Add to /etc/apt/sources.list

    deb http://ftp.debian.org/debian wheezy-backports main 

    Update & install android-tools-adb

    sudo apt-get update && sudo apt-get install android-tools-adb

• Prepare your phone.
  Turn on USB debugging:
  Settings –> General –> Developer options –> USB debugging.
  
  If you don’t see it:
  Settings –> General –> About phone –> Common –> Software info
  – click 5-10 times on Build number.
• Connect phone & run Terminal:

  adb devices

  adb shell

  reboot recovery

• Disconnect phone, plug in sdcard
• In recovery choose "apply update from external sdcard" – update.zip
  Choose "reboot system now"
  
  The phone will reboot.

FROM
Profit!

Brother MFC-7860DWR: install scanner

Download driver for scanner from LINK

• Open terminal & switch to root

  sudo su -

• Install driver

  dpkg  -i --force-all brscan4-0.4.2-1.amd64.deb

• Check if driver installed

  dpkg -l | grep Brother

• Add scanner via IP

  brsaneconfig4 -a  name=Brother_scan  model=MFC-7860DW  ip=192.168.0.10

• Check

  brsaneconfig4 -q  |  grep Brother

PROFIT!

Debian Mozilla (Wheezy)

• Add to /etc/apt/sources.list next line

  deb http://mozilla.debian.net/ wheezy-backports iceweasel-release
  

• Download pkg-mozilla-archive-keyring
  
• Install deb-package

  sudo dpkg -i pkg-mozilla-archive-keyring*

• Update repos & install newest Iceweasel:

  sudo apt-get update
  sudo apt-get install -t wheezy-backports iceweasel
  

debian-multimedia repo: GPG error

# apt-get update 
...
...
...
 W: GPG error: http://www.deb-multimedia.org testing InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907

Solution:

 apt-get install deb-multimedia-keyring