How to delete Google account from a factory-resetted phone?

Question

I have an Android 5.x smartphone ("phone 1"), which was using my Google account. Recently, I've started using different one, so I've (pretty confident that I've) dropped Google account on "phone 1", and then after having all things set up on "phone 2", I've made a factory reset on "phone 1"

However, when my son is now trying to begin using "phone 1", the initialization procedure REQUIRES him to use the account that was used on this phone before !! I presume this is good for protection against thieves, but how can I allow him use this phone ? I don't want to login under my account on that phone again

Welcome to Android Enthusiasts! I've just added the factory-reset tag to your question. What you're encountering here is called "Factory Reset Protection" (FRP). Please check our factory-reset tag-wiki for the corresponding section. — Izzy, Jul 30 '18 at 11:16
How did you reset the device? I mean was it from the recovery or from within the Android system? The devices I've used have only thrown the FRP thing when I wipe the device via recovery, just how a thief would do because he won't have access to the Android system. — singhnsk, Jul 31 '18 at 03:45
When you enter your Google account information to remove the FRP, it doesn't add the account to the phone until you tell it to. You can enter your account information to remove the lock without adding the account to the phone. — acejavelin, Aug 01 '18 at 18:39
Possible duplicate of How to bypass "Verify your account" (Factory Reset Protection) — acejavelin, Aug 01 '18 at 18:39

score 2 · Answer 1 · answered Aug 01 '18 at 17:19

(I've done reset via some hardware menu, it had such items as wipe device, etc.)

After asking the question:

I've logged into Google Accounts as that user on a desktop, and removed that device from a list of "my devices"

It did not change anything.

Then I've logged on THE DEVICE as that user. Then I was provided an option to login as a different Google account, as I did. So that solved my problem.

How to delete Google account from a factory-resetted phone?

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