[Q] Applied OTA last week - Unable to apply latest one topic

Hi,

I have a European HTC One M8 (CID HTC__203) and I unlocked the bootloader some time ago, using the HTCDev method. I installed the OTA update for version 3.28.401.9 last week, it worked fine. I got the notification for the Lollipop OTA update yesterday and it failed to install it (red triangle of death). At that point, I was really out of ideas as to why one update would work fine and the next one wouldn't, so I searched and searched and I did the following:

* Reinstall the stock recovery for my version (3.28.401.9)
* Relock the bootloader and reinstall the firmware for 3.28.401.9 (installing the firmware while unlocked wouldn't work)

The OTA still fails and I'm now stuck in the following state:

*** Software status: Modified ***
*** RELOCKED ***
S-ON

Trying to re-unlock the bootloader with the HTC unlock code won't work.

I no longer need a custom recovery, SU, S-OFF or whatever modification and I would like to go back to a state where I can just apply OTAs as they come and not care about anything else, but since I'm stuck with a locked bootloader, I can do pretty much nothing.

Thanks in advance for you help !