https://www.gsmarena.com/htc_flyer-3829.php
That's a really, really dated phone. No, it is not possible to install and be able to run a current version of Android on it. HTC stopped supporting that model a decade or so back, and there's not going to be third-party, independent developers supporting a model like that either. Also, developers stopped supporting such old devices so any apps you can use on it will be out-of-date and not updatable. So don't get your hopes up you'll be able to upgrade this phone as some kind of everyday working phone. It has both hardware and software limitations so using it with any current online services will be a challenge as far as security and functionality in general.