Q: my iphone is not turning on and showing itunes logo and a usb..

Hi

If you have took your iPhone apart nobody hear can help you

You have broken your iphone you need to buy another iphone.

We could have helped you before it was only a software problem .

But we cannot help you now sorry.

Apple will not help you.

Cheers

Brian ( uk)

iPhones don't have removable batteries. Your phone is now completely unsupportable. Go buy a new one.

The iPhone does not have a removeable battery, so we don't know what damage was done when you removed it. That aside, error code 20 indicates your device or computer might have a hardware issue that stops the update or restore from completing.

1.Check that your security software and settings aren't blocking your device from communicating with the Apple update server.
2.Then try to restore your iOS device two more times while connected with a cable, computer, and network you know are good.
3.Make sure that your security software and settings are allowing communication between your device and update servers.
4.If you still see the error message when you update or restore, the phone may be unrecoverable.

iCloud storage upgrades and downgrades - Apple Support

HI

WHAT DONT YOU UNDERSTAND YOU HAVE BROKEN YOUR PHONE

NOW GO AWAY AND BUY ANOTHER ONE.

YOU CANNOT GET ANY HELP FROM THIS FORUM

YOU SHOULD NOT HAVE TALEN THE BATTERY OUT.

CHEERS

BRIAN

It doesn't matter how careful you were. You can not get help here or from Apple. It's broken. By opening it up, you have forfeited all rights to service and support on that phone.  Find a competent 3rd party repair shop that might be able to help you or buy a new phone.

When you opened your iPhone yourself you voided your phone's warranty and any assistance from this site.