Me too faced some issue in reading flash when I was writing a structure in flash whose length was 650 bytes.
But when we get the length of flash ID using api “adl_flhExists” it gives wrong value ,
2017/10/24;16:25:01:426;010;ADL;22;[ADL] flash subs 6 : -4
2017/10/24;16:25:01:426;011;ADL;22;Flh Obj 0000 Len : 650
2017/10/24;16:25:01:426;012;ADL;3;connProfile id: 0 exists length: 138
Be careful when you use adl_flhExists returned length when you want to read it into structure.