missing tiles on China img. map data

Hi, I have problem seeng some tiles.

I installed img.files of China to GPS, but some tiles are missing.
I tried both whole country img. data and custom tile selection, but in either case,
same tiles are missing, in any zooming size.
I have no problem seeing other country’s data.

GPS hard ware is BMW Navi V, which is based on recent Garmin model,
and I installed img. data in micro SD.

Can anyone help me please ?

Is Lambertus the source of the img data?
Do you have other maps installed on the micro SD? If yes, also from Lambertus ? In this case it is probably a problem of FID, all maps from Lambertus have FID=2000 which gives conflicts, if more than one map is installed.