I managed to wipe all data and remove the unknown PIN.
I'm not sure if it's related, but the 0522 rooted edition gives a lot of Stopped Responding for launcher, SystemUI and other stuff, although RAM use hardly exceeds 2GB...
But my SMB LAN app works perfectly now.
About nvidia Shield: I didn't want to get Shield because the hardware seems old, I used to have WDTV that's software stable but became obsolete codec wise.
I tried a Xiaomi 3S but it didn't work with Netflix DRM despite the claims.
So I got a Chromecast Ultra to play the paid DRM stuff, and x99 to play the odd codecs like hi10p, and be my file/media server.
I could've gotten a mini PC but it's hot n noisy

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