I write from experience with many Devices, from Samsung over Huawei to xx "China special":
I have learned: as of Android 6, some iGO Primo Nextgen only understood Folder addons/. Name such as igo_map etc. were not recognized/found.
Since this Android version until now Pie there were no more Problems with addons/ 100th Device
but critically just google.Play.Protect active (especially at Samsung) and very critical the idiosyncratic MIUI from XIAOMI 
I managed to get an NG_Gift 27.681657 on a Redmi 7 to run today, before I had tried almost everything Nextgen with different SYS.txt; all stopped with a black Screen.
Why an iGO_Gift 27.681657 started today, but an NG_Gift 27.687519 only got to the black Screen remains a mystery! ??
** there was no MIUI Update in between, I still have Global v.11.0.2.0
Just my Experiences and Feedback from many Friends for whom I often bought and configured the Device.....
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