No OTA updates

[DuoDex]

Hello. I have an unrooted and locked version of the US dev version. I currently am running 2.18.617.1 and software update gives no update to 2.18.617.21 available. How can I fix this?

 

[DeadlyByNite]

Hello. I have an unrooted and locked version of the US dev version. I currently am running 2.18.617.1 and software update gives no update to 2.18.617.21 available. How can I fix this?

I was having this problem as well. It ultimately led me to downgrade to MM firmware and use LineageOS rom. I am rooted, with S-Off, TWRP recovery, unlocked bootloader. I have even tried to RUU back to 1.57.617.20 (which removed root and TWRP) and updated OTA from 1.57.617.20 all the way up to 2.18.617.1 but after that, it would say that my phone is up to date. However, you can go to the RUU collection thread and download the latest RUU, or it's also available on the HTC website.