On this page, you will find the Download link of Lemon B399 Firmware (flash file), which can be flashed on the device to fix it without the need of any other software.
Lemon B399 Firmware comes as a zip file and is of 11 MB in size. Firstly, You need to extract the zip file on your computer and flash it using the flashtool.
The file version of Lemon B399 Firmware is V1 and it was released on 03/06/2014.
File Name: Lemon_B399_M721_03062014.zip
Alternate Name: Lemon B399 M721 03062014
File Size: 11 MB
Released date: 03/06/2014