Can I downgrade to the stable ROM again or brick?

[skan]

Some people say there is an antirollback mechanism.
Is it the same with the Mi8?
What if I try MIU 10 beta I find it doesn't work well and I want to come back to MIU 9.
How do I need to proceed?

 

[phunhu2016]

Just flash MIUI 9 as normal. The new anti rollback doesn't apply for mi 8 yet

 

[skan]

Just flash MIUI 9 as normal. The new anti rollback doesn't apply for mi 8 yet

Can we be sure of that?
Where can I read the details written?