Without upgrading the custom theme itself, along with Opencart v3.x releases, better to ask the wizard of oz. Disney could create quite of fascinating things when creating movies in the industry at times. The cinematic CGIs, in this case, may not be magical enough to provide what you need, however.
Otherwise, back to Business. If you can upgrade your custom theme, that would be the best option after upgrading the core and its database. If you'd like to get this done professionally, you could always create a new service request in the Commercial Support section of the forum or to contact a reliable Opencart partner by using the Resources link at the top of the site or by contacting me directly.
The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
Opencart.com Administrator / Quality Assurance Analyst / Programmer / Opencart Tester
Purchasing a 18.104.22.168 in 2020 and wish to bring along the same theme to 3.0.x. If it's a common question then there must be themes available made for this demand. So it's time for you to go and check the compatibility status of your current theme and prepare for the upgrade.
About the database update, we can excellently help you at this task. And here's the instruction to refer to https://www.youtube.com/watch?v=x2WC8JyAJVs
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