Sorry about your trouble....
But where should we do this ??
The basic PCB is a product from Hispapanels.
Its NOT build or designed for Mobiflight
. Its planed to be used with the hispapanel own Controllers and there own Software.
Thats why we create our own "Adapter PCB" ....
Means the IDC Flat wire connector that are build by Hispapanels to connect the Panels to there controllers can remain.... we just connect them instead to our Adapters.
The Adapter on other side is connect to a Arduino.
All the needed adjustment work like change GRD and 5V for LED and the splitting into the Mega Pins is done on that PCB.
The reason why we offer this "Jumper" to decide for MF Logic or Hispa Logic is exactly for people like you!
If somebody already build the Panel by the Hispa logic he can set the Jumper that way.... If somebody mount the Hispapanels already reversed in case he know the problematic before then he can use our Adapter, too by set the Jumper the other way.
That Adapters was designed by Stephan and me for own usage.... We give Hispapanels the files to make them available for other users, and these guys produce and sold now that PCB´s. Thats all.
I´m sorry about your trouble.... But its not our fault i think.
If you buy a Panel from a other shop and you like to use it with MF, then you must inform yourself before if this is basically possible or if you maybe need some reworks and additional parts to make it compatible.
I do the same! Before i order the Hispa PCB i send a Email to the Shop Owner and ask him exactly that question if his LED are common Cathode or not.