cheers for your reply jonWW must say im somewhat nervous now !!! but if it goes badly wrong fingers crossed reflash should fix will be careful though...

thinking further should post more detail of this, process made screen go black as if locked , using power button would show unlock screen which i could use but once unlocked screen all messed up like dark, if press power button task window shows (turn off,offline mode etc) but was black so unreadable and stuck on screen,if use lock on side of phone only shows messed screen with stuck task window so could only turn off , am wondering if i should wait longer to see if screen restarts as maybe process not turned on yet ?