I have not yet updated my trezor since 2018. What steps do I take to ensure I do so safely & properly?

I bought my trezor (2 of them) back in Jan 2018. I am a HODLer, so when I bought my cryptocurrencies, I kept them locked away for almost 4 years. Now I want to access them and need to update my trezor. What do I need to do to ensure I do not mess up? I want to do so in a safe & proper way. Advice please

Hi, in order to update Trezor firmware please follow this user manual.
We strongly recommend you to do dry run recovery first to check the validity of your seed.