Hello Panimogerman,
Thanks for reaching out here in the Microsoft Answers Community.
Usually, large amounts of "hardware reserved" memory indicates that part of the memory did not pass the self-check at boot, and being marked as unusable.
Since the memory of the model you have mentioned is soldered on the motherboard, it is likely that there is an issue in hardware or in the pre-installed system (which is customized by Lenovo).
Since it is recently purchased, I recommend contacting Lenovo support regarding the issue, for a warranty repair or replacement.
Thanks for your patience and understanding.
Best Regards,
Sheng G. - MSFT | Microsoft Community Support Specialist