Hi Flash2 users,
This guidance require more for your manual operate ability. If you can upgrade to MM from local update, you don't need to try this way. This guidance mainly for the users who have problems during local update and cannot successfully upgrade to Marshmallow. If you are good at flashing ROM, this guidance will be not difficult to follow.
Thanks to your support to Flash Team.
Step 1: download the flashtool file and unzip
Step 2: download and install the driver: Win32/Win64
Step 3: download the Marshmallow file and unzip (This is not the local update file. They are different)
Step 4: make sure you have already backup all your data
Step 5: power off your phone, remove your SIM card and SD card
Step 6: insert the cable to PC firstly, don't connect the phone
Step 7: start the flashtool
Step 8: select the file
Step 9: select "firmware upgrade"
Step 10: click "download"
Step 11: connect your phone with the cable now
Step 12: download start
Step 13: downloading
Step 14: download finish, disconnect your phone
Step 15: power on, it will take around 5 minutes to enter the system.