How to Reflash Zgemma-star H1/2S guide

Sorry to jump on this thread, I've got a H1 which won't flash? It kept crashing so tried the usual method of format usb copy over flash file and press power to flash from USB but an hour in and its still just got FLSH on the front dial and not done anything? trying to flash with openatv 6.3 anything I should be trying or not? Any help be much appreciated.
 
Hi Guys how long should it take to initialise a 128gb usb my one just gets to 51/100 and seems to stop at that maybe Im not leaving it long enough any thoughts guys would be appreciated.
 
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