I had an a1708 macbook where it wouldn’t boot up. Microcenter told me $800 to repair logic board and that wouldn’t even guarantee the disk would be recoverable. I ended up buying a new macbook. After several months, I read about the “target disk mode” where you can just connect two computers together using USB C cable and treat the one computer as an external disk. I really thought it wouldn’t work…thinking Microcenter would have actually tried that. But, I bought the $25 cable nonetheless. And, it worked!! All you have to do is press the T key and then power it on in order to get to the “target disk mode”. This solution may be unique to me as my macbook would just get stuck in boot mode. If you can’t power it on, then I guess you’ll have to find another macbook with the same model to swap the SSD in.