Most of information can be found in SKYbrary:
https://www.skybrary.aero/index.php/B38M,_en-route,_northeast_of_Jakarta_Indonesia,_2018
https://www.skybrary.aero/index.php/B38M,_en-route_south_east_of_Addis_Ababa_Ethiopia,_2019
We have contributed to an article about its return to operation, which you can find here: