Ok, get some WD-40 and spray alittle bit on and around the bolt , let it sit for about 10-15mins to let it sink in, then get a HEX ring spanner and try it then, (HEX ring spanners are the best for stripped bolts the grab hold very well) and last resort would be to use some LOck JAw pliers as it will grip and grab, but only use it if nessercery
(i had this problem many times good luck
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