Please excuse me for being rude, and I hated to use the word 'stupidity'

I got an old phone from my friend, the Samsung C5 Pro, a nice phone I decided to use as backup. Since my friend does not keep track of things and she is a computer-don't-know-how, without the login detail I did a hot key hard reset to the phone and set it up the usual way. After my Google a/c verified it asked me for the a/c detail last synced with the phone, what the heck, the phone already reset no user data left why bother to authenticate something no longer exist !? I know Google may still linked the phone via Mac so that I've to unlink it to use with another a/c, but I don't have that detail, I tried some tricks I got from the internet but none worked, and I used other Samsung before without this problem. If Samsung must authenticate the phone with previous user detail, then it should completely block the factory reset without it, that so called factory reset protection thing is completely nonsense, or the factory reset should be called something else, now I got a small and good looking paper weight in my most hated collection.

I never liked Samsung one bit, I more used to LG, it's smarter in every way, but unfortunately it failed in the competition I don't know why. I decided to dig out my V20 to flash a new ROM, I believe I will have better chance, any comment ?

AFAIK every Android phone will do this. It's supposed to prevent one from selling a stolen phone.

There are tools for Samsung phones that *will* work, you just have to find the right one. I've done it on a phone I forgot the credentials for in the past.