No SIM Found

HTC started having problems taking photos. Video mode won't take any videos. Lens blur mode photos are severely under-exposed. Pretty sure Google Camera was working before. No FC, just hang or reboot.

Reflashed to the previous stable build to compare. Still not working. Maybe it needs a full wipe (format /data). If that's the case, might as well use the latest nightly build and the latest gapps. One thing I noticed, the phone didn't ask for the SIM unlock code anymore. Outgoing mobile calls work, but incoming calls go straight to voicemail.

After flashing to the latest build, now it tells me "No SIM found". Flashed back to the last stable build. Same thing. Tried the SIM on another phone, and it works fine. So possibly the SIM module got broken somehow. A bit more fiddling, then I noticed that I've been inserting the SIM card the wrong way. Turns out the HTC accepts either ends of the SIM card. Bad design.