htc desire 816 stuck at boot screen..

hi everyone. my htc desire 816 was running on lollipop 5.0.1(htc a5 dwg india version dual sim). it was rooted and bootloader unlocked and for rooting i had flashed cwm recovery... so everything was going fine. then i recieved update notification for marsh mallow (first step of which is of 68.2 mb). so i flashed stock recovery and downloaded the update.. but while installing i got red triangle error. i tried to install 2- 3 times but result was same. then i read one thread on our forum in which it was mentioned to flash the stock recovery which i recieved in 68.2 mb update file. i flashed the stock recovery then downloaded the ota update and it got install .. everything went well. but the device is stuck at bootscreen with green htc logo.. thats it.. now when i connect my device in fastboot mode its getting detected in my pc's device manager but not in adb devices. so i am not able to use adb commands....
my device is still stuck at bootscreen from 1 week.. plz help plz plz pz.......