I decided to playback a bit with a Yamaha MU2000 that y upgrade to MU2000EX 2 years ago. When I upgraded it all went well and had no issues at all. The. Unpacked it and moved on to another hobby, during this time it’s been in store. Today I plugged it in an found out the power on me I does not look what it used to. There is only gibberish code on screen. Does not look like missing pixels as if the LCD was damaged but more as if the firmware got screwed somehow. I changed the internal battery (CR2032) but that did nothing.
Anyone has seen this before and knows how to fix it?… I see below info online

See pics