1. Copy the zip file of your version (2GB or 3GB, otherwise get a brick ) on the SD card and stick it into the console
It can be installed in three ways:
1. 1 Through the built-in application (if the prefix is ​​loaded), then run Update & Backup-local update-change zip (select the zip file from the card), tick the wipe data, wipe media and press Update, confirm-update
1. Through the stock recovery (if the prefix is ​​not loaded, bootlump), go into it: turn off the power, press the button inside the AV connector, do not let it go, plug in the power, enter the recovery (the android is drawn), then-Apply Update from EXT -Update from sdcard-select the firmware zip file from the list.
1. 3 Through the custom TWRP recovery , selecting "Install" - select the firmware file - svayp to confirm the start of the firmware.
I advise you to clean the data from the old firmware in the recovery, in each recovery different names, keywords: Wipe Data / Factory reset, Wipe Data / Cache, then reboot (Reboot system now, Reboot)
Supplement to instruction 1.3:
TWRP can be stitched without an SD card and USB flash drive, you can download firmware directly from the console or copy it to the preinstalled firmware (in internal memory) in a convenient folder (usually leave it at the root of the memory), reboot into TWRP (Any program from the market, or by holding the button inside the AV connector before starting the device), clear Dalvik, Cache, System, Data, except the last two (internal and external memory), after cleaning, simply install the previously downloaded firmware archive.