G920W8 Note 5 BL3 downgrade??

Hi Guys,

My note 5 with telus is on 6.0.1(N920W8VLS3BPF1)
as you can see it’s BL3, is there any way I can downgrade to 5.1.1?
or write cert on 6.0.1?

Already tried and did not work:

ODIN flash stock
Smart switch flash stock
Flash older modem to write cert

Please let me know if anyone has an idea how to work around this.
Thank you very much!!