Need help with header image using R755 4.2.0 by varometro theme

So frustrating.
I updated my version and lost ALL my changes.
I have only a vague idea of how I got the header image there in the first place.
My header code doesn’t seem to match what is referenced on the forums.

Here’s what I have in my header.php:
<div id=”header”>
“>
<img src=”https://example.com/headerimage.jpg&#8221; alt=”<?php bloginfo(‘name’); ?>” />

<h1>/”>
<?php bloginfo(‘name’); ?>
</h1>

I would like the header banner to link back to the blog home.
Can anyone help?

Also, here’s what my CSS says about header – nothing about the size-
#header {
clear:both;
float:left;
width:100%;
border-bottom:solid 1px #eaeaea;
height:200px;
padding:0;