Need to get stock recovery back on modified GPE

I bought HTC one M7 unlocked from HTC.com when it came out. Last year I modified it to get rid of sense and made it "google play edition". I discovered I can't get OTA updates though due to the presence of stock recovery though.



Question: How can I get rid of TWRP and get back to stock recovery? fastboot getvar version-main returns empty :(

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