op6bimg.zip e:footer is wrong in HTC One M8

HTC One M8 - 0P6BIMG.zip returns e:footer is wrong e:signature verification installation aborted. Phone purchased unlocked and stopped working when OS update installed. Am not phone OS savvy. HTC advised they are unable to assist as CID is developer mode. Software status: official ***unlocked**** S-off
Advised to apply the 0p6bimg.zip from SD card but unable to continue as install aborted. Any thoughts where I go from here without bricking the device?

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