How can I fix a red triangle with an exclamation mark inside?

SamSiSpe

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Aug 14, 2015
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Red triangle with an exclamation mark inside

Hi, I have an unrooted HTC One M8 device running an Android 4.4.4 version. The system update (Android 5.0 Lollipop) should have been received last week. I didn't receive it, so I downloaded the update in order to install it manually. When I try to enter the Recovery mode to install the update I get a red triangle with an exclamation mark inside instead of the Android logo. So I have to press the volume up key with the power key simultaneously until the phone restarts itself. Is there a solution for this problem?
 
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