Hi there,
Files are sent. If you have ver1.3 at the moment:
1 first upgrade to 1.4 table with two disks
2 then upgrade to 1.6 table with two disks
3 then finally upgrade to 1.6 system with two disks.
The procedure is identical for each set of two disks.

Do not upgrade the keyboard if there are any risks of power cuts.
Double click each file in turn with a freshly formatted floppy in the A drive. Click Write/Start, close program when floppy stops writing and label disk.

It is VITAL to check each set of disks in the keyboard before attempting an upgrade.

1 insert disk 1 of a 2 disk set
2 hold down panel memories 1, 2, 3 and 4
3 switch on
4 release panel memories when screen appears
5 press checkdsk in screen
6 confirm with check in screen
7 swap with disk2 when screen prompts
8 wait for OK in screen
9 switch off

if each set of disks pass the test only then proceed to upgrade:

1 insert disk 1 of a 2 disk set
2 hold down panel memories 1, 2, 3 and 4
3 switch on
4 release panel memories when screen appears
5 press update in screen
6 confirm with update in screen
7 swap with disk2 when screen prompts
8 wait for OK in screen
9 switch off

again do 1.4 table first, then 1.6 table, then 1.6 system.

after the upgrade try a hard reset:
switch off
hold down 60s&70s, Mod Dance, Soul&RB rhythm buttons and switch on.

let's hope it's not a hardware fault but this should confirm if it is.