No service, broken all physical buttons, iOS update constraints, iphone 6

Hi, friends. Could you please help me find the problem I am having about my old iphone. I have an iPhone 6 that hasn't been used for a long time. The last time I activated, the iphone asked to update iOS to 12.4.7. Because I haven't updated it, the iPhone can't activate the network / data connection so that automatically the status signal bar on the iPhone says "no service" even though I have installed the SIM card correctly. I try to update, but it always fails during the iPhone backup process. Out of annoyance, I returned all the settings and made my iPhone look like a new iphone. After I reset everything, a "hello" page appears on the iPhone and the iPhone asks to press the "Home" button to open. Immediately, I just remembered that all the physical buttons on my iPhone were broken. Including the home button. I panicked outside. I tried to connect to iTunes, but the iTunes screen instead shows a page that says "Apple" only. like this. Please help, friends. I'm really stuck. thanks.