As you see the timestamp, I just freshly install the system and copy your dtb to the /boot, then install the script sbc-bench.sh, run it. After it finish, came to this post and wrote a result. I have not done any stability test yet. But if you have any recommended test, I'd love to do it now.
However, 2 years ago, I test the board BPi M1 on Armbian 5.25, my board is only stable at 1.152GHz.
So any suggestion for pushing its limitation, I will do it.