No point on giving up on this device so quickly...it is an iPhone 7 after all. At the very least, bring it to a reputable micro-solderer to see if they can find and fix the issue. Boot-loopers are tough and can have deep problems and aren't always repairable but most micro-soldering repair shops work on a no fix/no fee basis so there's not much risk involved.
Can you plug it into a USB ammeter to see if there is any current flow? Otherwise, many things can cause a boot-looping device. Give us more history by commenting on this answer.
A few things to try first if you haven't already:
- Try a hard reset (Home & Power button for 10 secs)
- Use a genuine Apple Lightning connector
- Use a genuine Apple charging brick and let it charge overnight
- Try to connect it to different computers (mac/pc if possible) with an updated iTunes
- Put the phone in recovery mode (search DFU Mode). Careful, this can reset your data
- Use 3uTools for putting it in and out of Recovery Mode
- Use 3uTools to flash the firmware (you can't downgrade)
- Check the condition of all the flexes (with magnification)
- Disconnect the Front Camera Ribbon from the logic board and reboot your phone
- Disconnect the screen assembly completely and see if iTunes will recognize the phone.
Otherwise, you may have a logic board issue.
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Try to boot your iPhone 7 into Recovery mode. First connect your device to computer with USB and open iTunes. And then keep pressing the "Side" button to shut down your iPhone. Next, hold down the "Volume Down" button for about 10 seconds (don't release the button until you see the "Connect to iTunes logo"). Use iTunes to restore iPhone 7.
crwdns2934271:0crwdnd2934271:0 danielleee1989 crwdne2934271:0
I tried this but it won’t go into recovery mode.
crwdns2934271:0crwdnd2934271:0 Jeannine Le Goff crwdne2934271:0
connect your iphone to your pc and open itunes then press the powerbutton and the volume down butten for 10 seconds then release the powerbutton but hold the volume down button untill you hear the usb connect sound or you see in itunes that your iphone is in recovery mode i tried it and it worked for me
crwdns2934271:0crwdnd2934271:0 Brent De Meersman crwdne2934271:0