Return it (or sell it, if returning isn't possible) and buy what you need.
I bought a new 2.5" SATA SSD for my laptop that has currently an M.2 SATA (pictures shown below) with converter. How can I install my new SSD (regular 2.5") into the laptop?
I bought this because I didn't know that it has an M.2 in it until disassembling it btw :/
Picture 1, picture 2
Thanks in advance for your help!