Hey,
The policy, including the details of what's covered, can be viewed at the following web address: https://download.lenovo.com/pccbbs/thinkcentre_pdf/l505-0010-03_en_update.pdf, and installing another M.2 shouldn't void your warranty, but if there are any components damaged during installation, these damages will not be covered.
Please feel free to reach out to us with any other questions!
1 week, 2 days ago
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Lenovo Product Expert