Stock Recovery

Dear friends,
I have an HTC one M8
Android-5.0.1
Network Provider- Three Republic of Ireland
Bootloader status- Unlocked
S-ON
CID-H3G__001
I am trying to do an OTA-4.25.771.6
I was on TWRP Custom Recovery
I tried to reflash to stock recovery to do the OTA and unsuccessfully tried the below mentioned Stock recoveries from XDA developers.

stock+recovery+1.54.771.5+recovery.img
and
stock+recovery+1.12.771+recovery.img
I see a Red triangle with an exclamation mark when I try to run the Stock Recovery.
Can anybody suggest any solutions
Many Thanks