Ok i think zgemma H5.2s series with Si2167 B tuner have some issue with scanning working on some frequencies :
Twin LNB , 2 cables connected directly to zgemma cables changed(swapped) during test same symptoms on both: Satellite installation check and confirmed working correctly on 2 different satellite meter (HORIZON, DR 1000)
1) when scan tuner A box founding 913 channels
2) when scan tuner B box founding only 1983
(scanned sattellite is Hot Bird 13E)
Conclusion:
I have 3x zgemma h5.2s with same symptoms TUNER B Si2167 defective wont work on some frequencies tested on OpenPLi 4
Please if anybody own this box please check this issue