How to revert orignal system softwer of htc one m8

[Android Central Question]

I am not able to update my phone to the htc updated software . Getting an message " we have determined that your phone may be running a modified version of its system software for your protection we cannot we cannot update your phone please revert your phone to the official htc system software to update your phone

 

[Rukbat]

That happens if you root the phone or if you install something other than Android (like LineageOS or a custom ROM). See https://htc-one.gadgethacks.com/how-to/return-your-htc-one-100-stock-unroot-update-0160374/ to revert it to stock.