Returning to stock firmware of Xiaomi Hub DGNWG05LM

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Guys,
long time ago I was using this how-to for converting the Xiaomi Hub to openlumi with zigbee2mqtt coordinator and using few of these with my Home Assistsnt.
These days, I’m trying to restore my last two devices back to the stock firmware for donating these to other family members for use at their house.

I was following same how-to and specifically the subsection " Return to stock firmware". Luckily, I had all of their backup files and following the tricky procedure with USB+UART soldering and flashing, eventually got there.

Now I have the first device working with their android app but noticed that can’t pair zigbee devices. While reading again, realized that a critical part of instruction not yet accomplished.
certain commands such

touch /home/root/need_update_coordinator.tag

should be executed after login stock firmware serial console.

We are reaching now my issue and my question:
What is the default credential for login to the console (see below)?

Freescale i.MX Release Distro 4.1.15-2.0.0 imx6ull14x14ev
Freescale i.MX Release Distro 4.1.15-2.0.0 imx6ull14x14evk /dev/ttymxc0

imx6ull14x14evk login:

I have tried with my xiaomi ID/password, root/root admin/admin, combinations with username and blank password but nothing is working.

Could you help me with this situation?

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The solution is there, in the How-to!! (and this is a not to myself for the future)
Bad translation is not assisting you to understand the workflow!
You need to gain root access and then replacing the unknown password with what you want!
That’s all folks!