flash drive doesn't work after pc shutting down during win2flash

i tried booting my usb drive with windows xp with win2flash
suddently the pc turned off and when it turned it on again the usb isn't detected by my pc .
i connected it to my laptop and after 10 minutes with no activity , the driver instalation message appears . and it installed succesfully .
but now it show's me 8 mb instead of 1 gb and i get the following message :windows was unable to complete the format.
it is very important to somehow repair it cause is my friend's and it kinda has a value to him.
can you help me please?
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