How do I flash a sprint Samsung galaxy s2 for metro use

SOURCE: Need to reset samsung galaxy s2 phone. Can't

If you want to try a simple solution, Go to Settings, Wireless and Networks, then Turn on "Airplane Mode" wait until you see an airplane on the top status bar of your phone... then Turn OFF "Airplane mode"
If that doesn't work, and you want to reset your phone, take it to the place you bought it or any place that is on your carrier.

SOURCE: My Samsung galaxy s2 is just dead it doesn't even charge hw do I get it wrk

HI DEAR
IF YOUR S2 IS DEAD THEN IT MAY BE DUE TO 2 CONDITIONS
SOFTWARE: IF YOU WERE TRYING TO FLASH IT WITH CUSTOM ROMS OR IF YOU WERE UPDATING THE FIRMWARE AND THE THE PHONE DRAINED THE BATTERY IN BETWEEN THEN PROBABLY YOUR PHONE BOOT AREA HAS BEEN DAMAGED.IN THIS CASE IT CAN BE REPAIRED BY A PROCESS CALLED RESSURECTION.IT REQUIRES PROFESSIONAL TOOLS LIKE GPG JTAG,RIFF BOX,MEDUSA,ORT JTAG ETC PLUS PROFESIONAL SOLDERING SKILLS.FOR INFO GOOGLE IT WITH ONE OF TOOLS NAME
2)HARDWARE:IN THIS SITUATION YOUR MOBILES PCB HAVE FAULTS LIKE SHORTING,WATER LOGED,DAMAGED CHIPS ETC.IN THIS CASE YOU CAN VISIT HARDWARE REPAIR PERSON/SERVICE CENTER

SOURCE: How to restore data from Samsung galaxy s2 when

The broken screen would not due to your data loss, just try the way below to recover Samsung galaxy

http://www.any-data-recovery.com/topics/mobile-devices/recover-samsung-galaxy.html