FIRST INSTALL M800 V3 VERSION, THEN GO TO SETTINGS, WIRLESS UPDATE, LOCAL UPDATE AND CHOSE FIRST FILE V4,
THEN WHEN FINISH CHOSE V5 AND LAST IS V6. U NEED TO COPY V4, V5 AND V6 UPDATES ON INTERNAL STORAGE.
WHEN YOU FINISH, FACTORY RESET PHONE AND ENJOY IN MARSHMALLOW. BATTERY BUG IS FIXED, ALL IS WORKING. 
VANILLA MARSHMALLOW WITHOUT ANY MODIFICATIONS. THERE IS NO PICTURES BECAUSE IS STOCK ROM. P.S M800 V3 INSTALL TROUGH SP FLASH TOOL, IF U GOT ERROR, CHOSE FIRMWARE UPGRADE NOT DONLOAD AND TRY AGAIN. IT WILL WORK THEN