Spawnzion

hello every one sorry my English is not so good am from Spain Well my experience yestarday trying to connect Helix with a Marsahll JVM410H was a little Confuse. i do this i conect midi cable from Helix to the Amp I set one of switch as program/bank Program 1 and dont touch anything more press bottom to see if amp reconoize recognize the command and yes the amp save this action but in the moment when i want to save patch on Helix Helix screen turn Black and nothing more to do What can be a problem there Can you help me please Thaks