Htc m9 ota

HI ,
I HAVE A HTC M9 ON THE ee NETWORK UK AND WANT TO UPDATE THE SOFTWARE TO MARCHMELLOW 6.0 BUT CAN;T AS IVE ROOTED MY PHONE AND GET THE RED TRIANGLE WHEN I TRY TO INSTALL THE UPDATE. I USED TO UPDATE MY HTC M7 WITH NO PROBLEM BUT CAN'T GET MY HEAD AROUND THIS .
CAN ANYBODY HELP PLEASE

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