t585 tab flash problem

hi, i have t585 tab was stuck on frp , flashes combo xxu4arj1


to remove frp via adb



now will not accept firmware from 6.0.1 >7.1 tried them all keeps on giving error tried odin and z3x just will not accept any flash it is btu model uk



if flash back combo is on again every time but not accept sam firmware



any idea what going on with this