Since 2015 the first level is again the same 6 areas (now provinces) --- so the first level was current in GADM.
http://www.mefb.gov.mg/dgcf/textes-pdf/decentralisation/DECRETS/Decret%202015593%20creation%20des%20circonscriptions%20administratives.pdf
Subdivided into 24 prefectures and 117 districts (pretty much as it was, but with new level type names).
Since 2015 the first level is again the same 6 areas (now provinces) --- so the first level was current in GADM.
http://www.mefb.gov.mg/dgcf/textes-pdf/decentralisation/DECRETS/Decret%202015593%20creation%20des%20circonscriptions%20administratives.pdf
Subdivided into 24 prefectures and 117 districts (pretty much as it was, but with new level type names).