Service [Q] Where is update log ?

I am said to have an android update to install; i tap, phone reboots, and got a green circle; when the progress bar is at about 30%, the logo changes for a red triangle.

Where is the update log ? How can I track the issue ?

Is it possible to apply updates manually ?

Phone rooted and heavily modified. I did not changed that many things in /system, but I installed Xposed, and some plugins may have done more things than me.

I usually have TWRP, but I restaured the original recovery for this update.
HTC One M8, unpacked 2014-06-19 at 4PM; HTCDEV + SuperSU + S-Off + hone made random scripts at boot 2014-06-20 at 11:30PM .

HTC Sensation received July 27th 2011 (First HTC). Cracked Fre3vo 28th. Craked S-OFF via Revolutionary 30th with success on first attempt. LeeDrOiD 1.2.