FTM mode is what you need to run a recovery.
This may wipe your phone, although it didn't for the last person.
Visit ZTEs website and download the update tool on your PC. Boot into FTM, connect the phone to your PC and then run the tool. It will download a fresh software image to your phone. When it's done, follow the instructions and reboot. Your phone should be fixed.
Sorry ...you're in the blade2 (orange SF II) Forum but you haven't confirmed your model number. Flashing the wrong image may trash your phone. Provide these details please!!!!!
The osf2 is actually the zte crescent. It is identical to the French blade s, and 'similar' to the T-Mobile Vivacity/ telnor touch. (Difference = capacitive menu buttons)
ALL zte crescents above have either synaptec or atmel touchscreens.
THEN there's the ACTUAL Blade 2, released in Sweden so far, with a 1ghz arm7 CPU.. a totally different phone.
Confused? Join ZTE.
Oh, ZTE AND androidforums it seems
Blade2 is the board name and on about phone on the crescent.