Htc one m7 gpe update

I have htc one m7 gpe. Android version is 5.0.1. Build number : LRX22C.H3 release-keys
My phone is unrooted and its bootloader is locked.
In April I didnt receive android 5.1 ota update.
So I clear Google Service Framework and Google Play Service cash and data.
After that, when I click on System Updates, I see this message:
"Android L Upgrade for user/release-keys Couldn't download ..."
Now,
What I have to do to?
Is there any way to receive update?!
I reset my phone but it doesn't work.
Help me please!!!