Launching .CPR with the M4 on the Plus

[villain]

During the last days I wanted to make use of the option to launch CPRs on the Plus with the M4 for the very first time, as I wanted to watch 3dmaniaks2 on the real machine. Sadly with no success. I downloaded different CPR an tried to launch them. Pang, Navy Seals, Robocop2 and Plotting are working, Switchblade, Batman The Movie and Plotting don't. Pang for example is (according to what the M4 displays) a 512K CPR, Switchblade a 128K CPR. 

Is there anybody out there with some good advice? @Duke maybe... ;-)

[eto]

Just found some hints on a web page:

Check on the ROM page that ,,only 16 roms" is active otherwise it will not support 512K CPRs.

[dthrone]

See discussion here https://www.cpcwiki.eu/forum/games/soh-tactics-gx-is-not-working-6128-m4-board/msg237278/#msg237278

[villain]

Ok, I´m one step further... The option "Use only 16 slots" is activated and 3dmaniaks2, Batman The Movie and also Alcon2020 are working now. But the 128K-titles Klax and Switchblade still don't.