Broksonic CTVG-5463GVC Service menu code please?

[bdorset]

Does anyone have the code for Broksonic "service menu". Have already
tried: Holding VOL- and pressing CH+ or CH- or 8 or 0 or 9, non worked.

 

[Art]

Very little support for any of this manufacturer's products, same result as
if searching for APEX.