Change logo from mobile headers.

Access Policy ›› Customization : Advanced -> Form Factor: Full/Mobile Browser -> Branding -> Customization Settings -> Access Profiles -> [your_access_profile_name] -> Common -> Page Header Settings -> Header left image (Mobile Devices size)

Found it. Perfect!

Dear Team,

How do we make the same changes in the l2.0 firmware?

ArunThomas, The only difference that I can see from the above instructions is to use Customization: General instead of Customization: Advanced.