Whoa, you de-lidded the entire sdcard slot.
There were some pictures and discussions regarding the microsd in the first impressions thread as well
https://www.mobileread.com/forums/sh...d.php?t=342428
https://www.mobileread.com/forums/sh...43#post4166043
And some people in German ereader forum managed to remove the microsd card as well (from sister device Tolino Vision 6 which is also part of Rakuten/Kobo family of devices).
https://forum.alles-ebook.de/thread/...0020#post90020 (unfortunately it seems you have to register to see this content)
However, one of those users also damaged their device in the process.
My Libra 2 also had a few reboots but I hope this is a software issue (happened in the past with sickel / watchdog too - the firmware checks for hangs and reboots if it thinks there is a problem) and so far it only happened when hacking around in the telnet shell, not during normal use. So I just hope its a case of the software watchdog being a little trigger happy, it's happened before in older firmwares