You can try getting a SSD adapter that fits inside a older motherboard like this one, https://www.amazon.com/dp/B07NY25LRD/ref=cm_sw_r_cp_apa_glt_fabc_TY1WT5MAW186RTGHXSPD Make sure that would fit inside your computer though.

I ended up sending my 980 pro into Samsung repair center specifically so they could flash the firmware for me. Samsung gave me a prepaid shipping label with UPS, it took 2 days to get there, the next day Samsung called me to confirm they flashed the firmware and sent it back out the following day.

Thanks u/nachodogmtl. I'm updating the post with more pictures. It looks like I need a mounting kit for the NVMe to stand in place. Another option is to get a PCIe adaptor that I can put next to the Nvidia graphics card. Also, this guide seems to be useful - https://download.lenovo.com/pccbbs/thinkcentre_pdf/ts_p360_storage_configurator_v1.1.pdf