Flash memory Htc surround

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Name: Htc surround
Model: Htc surround
Software: Windows Phone 7.5
The total volume of memory: 14.63
Available volume: 12.12
OS Version: 7.10.8773.98
Firmware version number: 2250.21.50000.502
The version number of the equipment: 0003
Software Version: 5.66.09.09_22.46.50.21U
Hardware version: A.26.0.D4
Boot version: 1.52.2250.4 (120,323)
Version of the chip: SOC 2.2.5.0

there was one more unpleasant thing-a couple of hours after the flash, the phone is hung ...
I had to get the battery - put back in motion.
All settings are reset and the memory cleared
Show you how to avoid it in future

p.s. sorry for bad english, I'm from another country
Thanks in advance for your help