@daitalos : thanks for the hint, i did but same as before.
EDIT 1
tested with another ROM, same behaviour.
tested with SIM in the device before the installation process starts : it works with the other ROM.
need to try again with candysix to test out.
but you can try with another SIM on P5100 & look if the messenger remain...If remain, that means the card slot on tablet has the problem ( perhaps ) and not the SIM or Rom or some else...
@daitalos : I wipe the p5100, inserted the SIM card, and installed another ROM -> successfull! Now i will do it again from scratch with CandySix, this time having the SIM card in the slot before starting the isntallation process. I'll keep you informed;
Same problem with my P5100.
With CM13 SIM runs without problems but only with candy pin input doesn't run
I can insert any number but not unlock sim