iPhone stuck on restore with no Mac to restore

The OP asked how to restore without any Mac or (any other) computer. The support article that you posted requires that the iPhone be connected to a computer / PC.

Restore your iPhone, iPad, or iPod touch in iTunes on PC - Apple Support

you'll need to borrow a computer or bring it into an Apple store

Hello,

Please follow the support article linked bellow to restore your iPhone without a Mac.

Restore your iPhone, iPad, or iPod touch in iTunes on PC - Apple Support

Thanks!