I have 1 unit samsung galaxy B5510. the problem is hang up and reboot,
so i try to make hard reset. and after that, nothing happen, always restart and reboot.
so i try to use Odin flasher from galaxy young S5360 and i download the firmware from Z3x
B5510DXKK1_OLBKK1
to make download mode or flash mode
HOLD the Volume down and Menu and click the power Button
now you can see the android logo
and click volume up for flashing mode..
and insert usb cable to computer and you will see the comport..
and click the start.
Done...