Endless restart

[NataliyaL]

Hello, my smartphone has begun to restart itself by 12 hours now. I can not access the menu or reset. At one point I was able to set up an update and wait for 6 hours. The display is white and only runs Xperia's logo. What to do? Thanks!

[Brobddy]

1) return phone back to seller

2) read /t5/Xperia-XA-XA-Ultra/Xperia-XA-stuck-in-boot-loop/td-p/1203069

3) read /t5/Xperia-XA-XA-Ultra/Xperia-XA-boot-loop/td-p/1193055

4) read /t5/Xperia-T-series/boot-loop/td-p/993571

5) UTUBE https://www.youtube.com/watch?v=g_j-QnPqETM