My iPhone X was stuck in a boot loop as well. I let it go completely dead (took about 1.5 days) hoping that it would refresh once charged for a few minutes. NOPE, still didn’t come on I let the battery die out again and left it alone for a few days and it came back on. YAYY! RIGHT!? Nope a few days later it went out again and came back on 10 minutes later. Now, here I am again and it went out, it have been out 3 days and still isn't working. I wasn’t thinking I should’ve checked the last back up. I’m scared to try any of the options listed because I really need some pictures and other stuff off of my phone. Hopefully, it will come back on soon