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Compiler/UCD3138: what is the difference between arm complier 5.2.4 and 5.2.9 for UCD3138 ?

Part Number: UCD3138

Tool/software: TI C/C++ Compiler

When the code is compliled by  5.2.4 version, It is OK. 

If using 5.2.9 complier,  choosing "write program checksum" , the code can run well, but the UCD3138 can't be flashed again and can't be back to ROM mode for ever. 

So my question is that what difference between these two compliers ?  Thanks a lot.