Opencart update from 1.5.6.4 to version 3.0.3.2 Syntax Error

Hi
I am trying to update from 1.5.6.4 version to 3.0.3.2
I am getting this error message

Unknown: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/carrepa1/public_html/shop/system/library/db/mysql.php on line 7

Progress
SyntaxError: Unexpected token < in JSON at position 0 OK Unknown: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/carrepa1/public_html/shop/system/library/db/mysql.php on line 7{"success":"Patch 1000 has been applied (1 of 10)","next":"index.php?route=upgrade\/upgrade\/next&step=2"}


Below is the code for the file in question

<?php
namespace DB;
final class MySQLi {
private $connection;

public function __construct($hostname, $username, $password, $database, $port = '3306') {
$this->connection = new \mysqli($hostname, $username, $password, $database, $port);

if ($this->connection->connect_error) {
throw new \Exception('Error: ' . $this->connection->error . '<br />Error No: ' . $this->connection->errno);
}

$this->connection->set_charset("utf8");
$this->connection->query("SET SQL_MODE = ''");
}

public function query($sql) {
$query = $this->connection->query($sql);

if (!$this->connection->errno) {
if ($query instanceof \mysqli_result) {
$data = array();

while ($row = $query->fetch_assoc()) {
$data[] = $row;
}

$result = new \stdClass();
$result->num_rows = $query->num_rows;
$result->row = isset($data[0]) ? $data[0] : array();
$result->rows = $data;

$query->close();

return $result;
} else {
return true;
}
} else {
throw new \Exception('Error: ' . $this->connection->error . '<br />Error No: ' . $this->connection->errno . '<br />' . $sql);
}
}

public function escape($value) {
return $this->connection->real_escape_string($value);
}

public function countAffected() {
return $this->connection->affected_rows;
}

public function getLastId() {
return $this->connection->insert_id;
}

public function connected() {
return $this->connection->ping();
}

public function __destruct() {
$this->connection->close();
}
}


I have tried to read some other posts with similar problems with no luck. I am hoping someone can help me with this problem.

Thanks
Jamie

Upgrade step by step....

1.5.x to 2.1.x
2..1x to 2.3.x
2.3.x to 3.0.x

If not, search how to change MYSQLI in 1.5.6.4 then try to upgrade to 3.0.3.2
viewtopic.php?t=110180#p572236