Thanks and if you can share the changes that you did then I can test it with latest firmware where it cannot find sdcard on kernel boot.
Did you use gtking or gtkingpro dts?
Thank you for all your effort.
UPDATE:
I have tested with gtKing dts and it works fine as only change to am6 was the sdcard frequency.
Trying brcm firmware fails to load the wlan interface but firmware is loaded fine.
I will try multiple kernels to see if that helps.