I have stupidly random 2 smartphones at home samsung a huawei… For one of huawei I hardly need and can't get used to the much too complicated confusing huawei android system after so many years samsung… It is about 400 euro worth I can nowhere for 200 euro again?
The easiest way is probably Ebay, … Either you start an auction or give a fixed price, with the option to send you also price proposals.
You have several options:
keep in reserve.
give to someone who has an old, e.g. Your mother, siblings, Omma, what ever
on Ebay at a fixed price or as an auction
put in ebay classified ads. (But only ship if it was paid).
Android is actually Android. Everything self-explanatory.
But if you do not give the equipment, nobody can help you.
I'm currently repairing Huawei, the noblest things. 1200 euro, not an issue.