Default [Q] htc sensation stuck on splash screen

my girlfriends htc sensation is stuck on splash screen. it was s-off running vipers 5.1.0 with hboot 1.27 . she was trying to take a pik at night when the phone switched off. when she switched it on it was having a bootloop . she tried to go into recovery and somehow mangaed to delete/remove 4ext recovery which was there. so now if try enter recovery it just shows a black screen with a phone with a warning sign. can someone help me with a way forward
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