@Matthias_BL I managed to open it by using an "opener" that can be found on these cheap fix-it kits on amazon. Here some pics of mine:
https://ibb.co/SKr5FPQ
https://ibb.co/cTjxg6G
https://ibb.co/tMRzk7f
As you can read from my thread here
https://www.mobileread.com/forums/sh...55#post4269355 , my poor Onyx Boox Nova Pro got broken after using a Xiaomi fast charger to charge it.
If you want I can send it to you as spare parts. I am in Italy.