Phone won't start

1. All iphones from 6S will happily run ios14
2. follow these instructions exactly

If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

Note how long to hold the buttons

If that fails replace the phone

try

If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

Justlearning1 wrote: "My iPhone 7 froze one day..."

Shutting down can be a symptom of a battery in need of replacement:

"...The power management system determines the capability of the battery to supply this power, and manages the loads in order to maintain operations. When the operations can no longer be supported with the full capabilities of the power management system, the system will perform a shutdown to preserve these electronic components. While this shutdown is intentional from the device perspective, it may be unexpected by the user." [Source: Apple]

If the battery of your iPhone 7 is the original one, it quite likely needs replacement:

iPhone Battery & Power Repair

Found by searching Apple's Knowledge Base.

õ¿õ¬

My iPhone 7 froze one day. So naturally I powered it off and then turned it back on. Or at least I tried to turn it back on. It will not come on. The Apple logo comes up and goes away and then comes back and it repeats. Then I connected my phone to PC and attempted to update or restore. But neither one would work. I took it to a repair place and they couldn’t fix it either. Called Apple support and they told me to hard reset it but of course I had already tried that. Anyways. The phone and screen are not broken and I just can’t figure out why it just stopped. A phone store employee told me that the 8 and below are not equipped to handle the updates and it just stops working. But I’m hoping eventually I’ll figure it out.

my phone 11 I do not want to start only the black screen appears and the apple

Justlearning1

It might be a problem like bendgate which is a bad solder joint that would make your iphone have a bootloop.

so?